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6x-20=4x+15
We move all terms to the left:
6x-20-(4x+15)=0
We get rid of parentheses
6x-4x-15-20=0
We add all the numbers together, and all the variables
2x-35=0
We move all terms containing x to the left, all other terms to the right
2x=35
x=35/2
x=17+1/2
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