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9(7x - 6) - 18x= 9*7x + 9*(-6) - 18x = 63x - 54 - 18x =
= (63x - 18x) - 54 = 45x - 54
7a -6(19-a) = 7a - 6*19 - 6 *(-a) = 7a - 114 + 6a =
= (7a +6a) - 114 = 13a - 114
0.8(6x -2) +1.6(x-4) = 4.8x -1.6 + 1.6x - 6.4 = 6.4x - 8
2.8(5b -6c)-(7b-8a) * 1.2 = 14b - 16.8c - 8.4b + 9.6a =
= 9.6a + (14.0b - 8.4b) - 16.8c = 9.6a + 5.6b -16.8c
- (-4/9 - 5.8z) - (3.1z-5.6) = 4/9 + 5.8z -3.1z + 5.6 =
=2.7z + (4/9 + 28/5) = 2.7z + (20/45 + 252/45) =
= 2.7z + 6 ц. 2/45
8/15 * (2 ц. 1/4 *а - 7 ц. 1/2 *b) - 7/30 * (4 ц. 2/7 *а + 8ц. 4/7 *b) =
= 8/15 * 9/4 *a - 8/15 * 15/2 *b - 7/30 * 30/7 *a - 7/30 * 60/7 *b=
= 1.2a - 4b - a - 2b = (1.2a -a) - (4b + 2b) =
= 0.2a - 2b
= (63x - 18x) - 54 = 45x - 54
7a -6(19-a) = 7a - 6*19 - 6 *(-a) = 7a - 114 + 6a =
= (7a +6a) - 114 = 13a - 114
0.8(6x -2) +1.6(x-4) = 4.8x -1.6 + 1.6x - 6.4 = 6.4x - 8
2.8(5b -6c)-(7b-8a) * 1.2 = 14b - 16.8c - 8.4b + 9.6a =
= 9.6a + (14.0b - 8.4b) - 16.8c = 9.6a + 5.6b -16.8c
- (-4/9 - 5.8z) - (3.1z-5.6) = 4/9 + 5.8z -3.1z + 5.6 =
=2.7z + (4/9 + 28/5) = 2.7z + (20/45 + 252/45) =
= 2.7z + 6 ц. 2/45
8/15 * (2 ц. 1/4 *а - 7 ц. 1/2 *b) - 7/30 * (4 ц. 2/7 *а + 8ц. 4/7 *b) =
= 8/15 * 9/4 *a - 8/15 * 15/2 *b - 7/30 * 30/7 *a - 7/30 * 60/7 *b=
= 1.2a - 4b - a - 2b = (1.2a -a) - (4b + 2b) =
= 0.2a - 2b
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