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10x-20x+15=8x+7
We move all terms to the left:
10x-20x+15-(8x+7)=0
We add all the numbers together, and all the variables
-10x-(8x+7)+15=0
We get rid of parentheses
-10x-8x-7+15=0
We add all the numbers together, and all the variables
-18x+8=0
We move all terms containing x to the left, all other terms to the right
-18x=-8
x=-8/-18
x=4/9
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