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-3x+4=-9x-50
We move all terms to the left:
-3x+4-(-9x-50)=0
We get rid of parentheses
-3x+9x+50+4=0
We add all the numbers together, and all the variables
6x+54=0
We move all terms containing x to the left, all other terms to the right
6x=-54
x=-54/6
x=-9
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