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3x=21+7
3x=28/:3
x=9 1/3
4x+20=5
4x=5-20
4x= -15/:4
x= -15/4
x= -3 3/4
6x-17=35
6x=35+17
6x=52/:6
x=8 4/6
x=8 2/3
-1/4x+12= -16
-1/4x= -16-12
-1/4x=-28/:(-1/4)
x= -28*(-4)
x=112