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15x-30=50-5x
We move all terms to the left:
15x-30-(50-5x)=0
We add all the numbers together, and all the variables
15x-(-5x+50)-30=0
We get rid of parentheses
15x+5x-50-30=0
We add all the numbers together, and all the variables
20x-80=0
We move all terms containing x to the left, all other terms to the right
20x=80
x=80/20
x=4
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