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20+8x+5=9x+15
We move all terms to the left:
20+8x+5-(9x+15)=0
We add all the numbers together, and all the variables
8x-(9x+15)+25=0
We get rid of parentheses
8x-9x-15+25=0
We add all the numbers together, and all the variables
-1x+10=0
We move all terms containing x to the left, all other terms to the right
-x=-10
x=-10/-1
x=+10
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