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15-25=20-x
We move all terms to the left:
15-25-(20-x)=0
We add all the numbers together, and all the variables
-(-1x+20)+15-25=0
We add all the numbers together, and all the variables
-(-1x+20)-10=0
We get rid of parentheses
1x-20-10=0
We add all the numbers together, and all the variables
x-30=0
We move all terms containing x to the left, all other terms to the right
x=30
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