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