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6x+3x+12=5x+2x+25
We move all terms to the left:
6x+3x+12-(5x+2x+25)=0
We add all the numbers together, and all the variables
6x+3x-(7x+25)+12=0
We add all the numbers together, and all the variables
9x-(7x+25)+12=0
We get rid of parentheses
9x-7x-25+12=0
We add all the numbers together, and all the variables
2x-13=0
We move all terms containing x to the left, all other terms to the right
2x=13
x=13/2
x=6+1/2
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