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X*15=4X-20
We move all terms to the left:
X*15-(4X-20)=0
Wy multiply elements
15X-(4X-20)=0
We get rid of parentheses
15X-4X+20=0
We add all the numbers together, and all the variables
11X+20=0
We move all terms containing X to the left, all other terms to the right
11X=-20
X=-20/11
X=-1+9/11
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