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x=-4
b) 6x+12=30
6x=30-12
6x=18
x=18/6
x=3
d) 2y-4=0
2y= 4
y=4/2
y=2
2x-x=-11+7
x=-4
b) 6(x+2)=30
6x+12=30
6x=18
x=3
c) x-5=4x+10
-4x+x=10+5
-3x=15
x=-5
d) 2y-4=0
2y=4
y=2