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-5x+3+2x=12+3x+9
We move all terms to the left:
-5x+3+2x-(12+3x+9)=0
We add all the numbers together, and all the variables
-5x+2x-(3x+21)+3=0
We add all the numbers together, and all the variables
-3x-(3x+21)+3=0
We get rid of parentheses
-3x-3x-21+3=0
We add all the numbers together, and all the variables
-6x-18=0
We move all terms containing x to the left, all other terms to the right
-6x=18
x=18/-6
x=-3
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