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5x+3-2x=12+6x+21
We move all terms to the left:
5x+3-2x-(12+6x+21)=0
We add all the numbers together, and all the variables
5x-2x-(6x+33)+3=0
We add all the numbers together, and all the variables
3x-(6x+33)+3=0
We get rid of parentheses
3x-6x-33+3=0
We add all the numbers together, and all the variables
-3x-30=0
We move all terms containing x to the left, all other terms to the right
-3x=30
x=30/-3
x=-10
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