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ax=4d-bc
x=4d-bc/a
b)3nx-4m=nx+bn
3nx=nx+bn+4m
x=nx+bn+4m/3n
c)-4ax+b=2ax-c
-4ax-2ax=-c-b
-6ax=-c-b
x=-c-b/6a
d)3px-b+c=7px+4c
3px-7px=4c+b-c
-4px=3c+b-c
x=3c+b-c/4p