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3x+5(-9-2x)=4
We move all terms to the left:
3x+5(-9-2x)-(4)=0
We add all the numbers together, and all the variables
3x+5(-2x-9)-4=0
We multiply parentheses
3x-10x-45-4=0
We add all the numbers together, and all the variables
-7x-49=0
We move all terms containing x to the left, all other terms to the right
-7x=49
x=49/-7
x=-7
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