Question

1. -7x+8=9x
2. 4•(2-3x)=-7x+19
3. 7•(-3+2x)=-6x-1
4. 9-4x=-9x-4
5. -1-4•(-7+8x)=-2x-6

Answer 1

1)7x+8=9x
-7x-9x=-8
-16=-8
X=1/2

2)4•(2-3x)=-7х+19
8-12х=-7+19
-12х+7х=19-8
-5х=11
Х=-11/5=-2,2

3)7•(-3+2х)=-6-1
-21+14х=-6х-1
14х+6х=-1+21
20х=20
Х=1

Answer 2

$\displaystyle 1)-7x+8=9x\\-7x-9x=-8\\\-16x=-8\\\\x=\frac{1}{2}=0,5\\ \\2)4(2-3x)=-7x+19\\8-12x=-7x+19\\-12x+7x=19-8\\-5x=11\\\\x=-\frac{11}{5}=-2\frac{1}5}=-2,2\\ \\3)7*-3+2x)=-6x-1\\ -21+14x=-6x-1\\14x+6x=-1+21\\20x=20\\x=1\\\\4)9-4x=-9x-4\\-4x+9x=-4-9\\5x=-13\\\\x=-\frac{13}{5}=-2\frac{3}{5}=-2,6\\ \\5)-1-4(-7+8x)=-2x-6\\ -1+28-32x=-2x-6\\27-32x=-2x-6\\-32x+2x=-6-27\\-30x=-33\\\\x=\frac{11}{10}=1\frac{1}{10}=1,1$