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6x+15=4x+20
We move all terms to the left:
6x+15-(4x+20)=0
We get rid of parentheses
6x-4x-20+15=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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