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(5-2x)+(-4x+9)=120
We move all terms to the left:
(5-2x)+(-4x+9)-(120)=0
We add all the numbers together, and all the variables
(-2x+5)+(-4x+9)-120=0
We get rid of parentheses
-2x-4x+5+9-120=0
We add all the numbers together, and all the variables
-6x-106=0
We move all terms containing x to the left, all other terms to the right
-6x=106
x=106/-6
x=-17+2/3
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