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9x+7x+5+2x+7+5x=9x+42+x+9
We move all terms to the left:
9x+7x+5+2x+7+5x-(9x+42+x+9)=0
We add all the numbers together, and all the variables
9x+7x+2x+5x-(10x+51)+5+7=0
We add all the numbers together, and all the variables
23x-(10x+51)+12=0
We get rid of parentheses
23x-10x-51+12=0
We add all the numbers together, and all the variables
13x-39=0
We move all terms containing x to the left, all other terms to the right
13x=39
x=39/13
x=3
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