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3x+18+3x+12=7x+10
We move all terms to the left:
3x+18+3x+12-(7x+10)=0
We add all the numbers together, and all the variables
6x-(7x+10)+30=0
We get rid of parentheses
6x-7x-10+30=0
We add all the numbers together, and all the variables
-1x+20=0
We move all terms containing x to the left, all other terms to the right
-x=-20
x=-20/-1
x=+20
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