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(x+4)+(3x+9)=149
We move all terms to the left:
(x+4)+(3x+9)-(149)=0
We get rid of parentheses
x+3x+4+9-149=0
We add all the numbers together, and all the variables
4x-136=0
We move all terms containing x to the left, all other terms to the right
4x=136
x=136/4
x=34
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