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2x+3(5x+2)=21
We move all terms to the left:
2x+3(5x+2)-(21)=0
We multiply parentheses
2x+15x+6-21=0
We add all the numbers together, and all the variables
17x-15=0
We move all terms containing x to the left, all other terms to the right
17x=15
x=15/17
x=15/17
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