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(8x+4)+(-5x+2)+(9x-3)=51
We move all terms to the left:
(8x+4)+(-5x+2)+(9x-3)-(51)=0
We get rid of parentheses
8x-5x+9x+4+2-3-51=0
We add all the numbers together, and all the variables
12x-48=0
We move all terms containing x to the left, all other terms to the right
12x=48
x=48/12
x=4
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