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7x=21
x=3
b.2-4x=3
2-3=4x
-1=4x
x=-1/4
c.x-12=2x+36
x-2x=36+12
-x=48
x=-48
d.-5x-4x+10=1
-5x-4x=1-10
-9x=-9
x=1