Question

calcula la solucion de las siguientes ecuaciones
6x-(1-x)=4x-4
9x-(8+x+12)=-x+7
x+3(x-1)+4=8-x

Answer 1

6x-(1-x)=4x-4
6x-1+x=4x-4
7x-1=4x-4
7x-4x=-4+1
3x=-3
x=-3/3
x=-1

9x-(8+x+12)=-x+7
9x-8-x-12=-x+7
8x-20=-x+7
8x+x=7+20
9x=27
x=27/9
x=3

x+3(x-1)+4=8-x
x+3x-3+4=8-x
4x+1=8-x
4x+x=8-1
5x=7
x=7/5
x= 1 $\frac{2}{5}$ ó, x=1.4