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8+4x+9x+8=3x+12+8x
We move all terms to the left:
8+4x+9x+8-(3x+12+8x)=0
We add all the numbers together, and all the variables
4x+9x-(11x+12)+8+8=0
We add all the numbers together, and all the variables
13x-(11x+12)+16=0
We get rid of parentheses
13x-11x-12+16=0
We add all the numbers together, and all the variables
2x+4=0
We move all terms containing x to the left, all other terms to the right
2x=-4
x=-4/2
x=-2
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