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5x+10+4x+9=2x+12
We move all terms to the left:
5x+10+4x+9-(2x+12)=0
We add all the numbers together, and all the variables
9x-(2x+12)+19=0
We get rid of parentheses
9x-2x-12+19=0
We add all the numbers together, and all the variables
7x+7=0
We move all terms containing x to the left, all other terms to the right
7x=-7
x=-7/7
x=-1
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