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7(3x+4x)=56
We move all terms to the left:
7(3x+4x)-(56)=0
We add all the numbers together, and all the variables
7(+7x)-56=0
We multiply parentheses
49x-56=0
We move all terms containing x to the left, all other terms to the right
49x=56
x=56/49
x=1+1/7
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