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5x-15+4x+8=3x+12
We move all terms to the left:
5x-15+4x+8-(3x+12)=0
We add all the numbers together, and all the variables
9x-(3x+12)-7=0
We get rid of parentheses
9x-3x-12-7=0
We add all the numbers together, and all the variables
6x-19=0
We move all terms containing x to the left, all other terms to the right
6x=19
x=19/6
x=3+1/6
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