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x+x*20=270
We move all terms to the left:
x+x*20-(270)=0
Wy multiply elements
x+20x-270=0
We add all the numbers together, and all the variables
21x-270=0
We move all terms containing x to the left, all other terms to the right
21x=270
x=270/21
x=12+6/7
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