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(5x+2)+(4x+9)=56
We move all terms to the left:
(5x+2)+(4x+9)-(56)=0
We get rid of parentheses
5x+4x+2+9-56=0
We add all the numbers together, and all the variables
9x-45=0
We move all terms containing x to the left, all other terms to the right
9x=45
x=45/9
x=5
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