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5+4x=8x-15
We move all terms to the left:
5+4x-(8x-15)=0
We get rid of parentheses
4x-8x+15+5=0
We add all the numbers together, and all the variables
-4x+20=0
We move all terms containing x to the left, all other terms to the right
-4x=-20
x=-20/-4
x=+5
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