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4x+3(x+2)=21
We move all terms to the left:
4x+3(x+2)-(21)=0
We multiply parentheses
4x+3x+6-21=0
We add all the numbers together, and all the variables
7x-15=0
We move all terms containing x to the left, all other terms to the right
7x=15
x=15/7
x=2+1/7
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