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20=4x-15
We move all terms to the left:
20-(4x-15)=0
We get rid of parentheses
-4x+15+20=0
We add all the numbers together, and all the variables
-4x+35=0
We move all terms containing x to the left, all other terms to the right
-4x=-35
x=-35/-4
x=8+3/4
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