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20-x=5*3
We move all terms to the left:
20-x-(5*3)=0
We add all the numbers together, and all the variables
-x+20-15=0
We add all the numbers together, and all the variables
-1x+5=0
We move all terms containing x to the left, all other terms to the right
-x=-5
x=-5/-1
x=+5
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