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15x-30=20-10x
We move all terms to the left:
15x-30-(20-10x)=0
We add all the numbers together, and all the variables
15x-(-10x+20)-30=0
We get rid of parentheses
15x+10x-20-30=0
We add all the numbers together, and all the variables
25x-50=0
We move all terms containing x to the left, all other terms to the right
25x=50
x=50/25
x=2
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