Question

Решите уравнение
4x-12,8=0

7x-9=3x+7


1,6(5x-1)=1,8-4,7

Answer 1

1) 4х - 12.8 = 0
4х = 12.8 | : 4
х = 3.2
2) 7х - 9 = 3х + 7
7х - 3х = 7 + 9
4х = 16 | : 4
х = 4
3) 1.6 (5х - 1) =1.8-4.7
8 х - 1.6 = - 2.9
8х = -1.3 | : 8
х = - 0.16

Answer 2

1)7х-9=3х+7 7х-3х=7+9. 4х=16 х=16:4. х=4.