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7(5x+3x)+13=35+21+13
We move all terms to the left:
7(5x+3x)+13-(35+21+13)=0
We add all the numbers together, and all the variables
7(+8x)+13-69=0
We add all the numbers together, and all the variables
7(+8x)-56=0
We multiply parentheses
56x-56=0
We move all terms containing x to the left, all other terms to the right
56x=56
x=56/56
x=1
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