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2x+3x+12=75-12
We move all terms to the left:
2x+3x+12-(75-12)=0
We add all the numbers together, and all the variables
2x+3x+12-63=0
We add all the numbers together, and all the variables
5x-51=0
We move all terms containing x to the left, all other terms to the right
5x=51
x=51/5
x=10+1/5
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