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3x-15=-4x-50
We move all terms to the left:
3x-15-(-4x-50)=0
We get rid of parentheses
3x+4x+50-15=0
We add all the numbers together, and all the variables
7x+35=0
We move all terms containing x to the left, all other terms to the right
7x=-35
x=-35/7
x=-5
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