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7x-3x=40+16
We move all terms to the left:
7x-3x-(40+16)=0
We add all the numbers together, and all the variables
7x-3x-56=0
We add all the numbers together, and all the variables
4x-56=0
We move all terms containing x to the left, all other terms to the right
4x=56
x=56/4
x=14
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