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3x+6(x-2)=51
We move all terms to the left:
3x+6(x-2)-(51)=0
We multiply parentheses
3x+6x-12-51=0
We add all the numbers together, and all the variables
9x-63=0
We move all terms containing x to the left, all other terms to the right
9x=63
x=63/9
x=7
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