•x-1=7(-1)
x-1=-7
x=-7+1
x=-6
•x-2=1+4x
x-4x=1+2
-3x=3
x=3:(-3)
x=-1
•5x+5=5(x-1)
5x+5=5x-5
5x-5x=-5-5
0≠-10
•x-1=7(-1)
x-1=-7
x=-7+1
x=-6
•x-2=1+4x
x-4x=1+2
-3x=3
x=3:(-3)
x=-1
•5x+5=5(x-1)
5x+5=5x-5
5x-5x=-5-5
0≠-10