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5(x+3)=4x+21
We move all terms to the left:
5(x+3)-(4x+21)=0
We multiply parentheses
5x-(4x+21)+15=0
We get rid of parentheses
5x-4x-21+15=0
We add all the numbers together, and all the variables
x-6=0
We move all terms containing x to the left, all other terms to the right
x=6
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