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3(5+4x)=63
We move all terms to the left:
3(5+4x)-(63)=0
We add all the numbers together, and all the variables
3(4x+5)-63=0
We multiply parentheses
12x+15-63=0
We add all the numbers together, and all the variables
12x-48=0
We move all terms containing x to the left, all other terms to the right
12x=48
x=48/12
x=4
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