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3x=6
X=2
b. -4x+20=-16
-4x=4
X=-1
C.-5(2x-1)=-45
-10x+5=-45
-10x=-40
X=4
D. -13x=169
X=-13
b)-4x=-16-20=-36:4
c)-10x+5=-45=-45-5=-50:-10=+5
d)+13x=169:13=13