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20+6x=15+4x
We move all terms to the left:
20+6x-(15+4x)=0
We add all the numbers together, and all the variables
6x-(4x+15)+20=0
We get rid of parentheses
6x-4x-15+20=0
We add all the numbers together, and all the variables
2x+5=0
We move all terms containing x to the left, all other terms to the right
2x=-5
x=-5/2
x=-2+1/2
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