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21+5(x-3)=56
We move all terms to the left:
21+5(x-3)-(56)=0
We add all the numbers together, and all the variables
5(x-3)-35=0
We multiply parentheses
5x-15-35=0
We add all the numbers together, and all the variables
5x-50=0
We move all terms containing x to the left, all other terms to the right
5x=50
x=50/5
x=10
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