7*8=56
7*x=7x
3x+56-7x+4=4+3x+56-7x
3x-7x+3x-7x=4+56+4+56
6x-14x=116
8x=116
x=116/8
x=16
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7*8=56
7*x=7x
3x+56-7x+4=4+3x+56-7x
3x-7x+3x-7x=4+56+4+56
6x-14x=116
8x=116
x=116/8
x=16