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6x+20=4x+10=8x+12
We move all terms to the left:
6x+20-(4x+10)=0
We get rid of parentheses
6x-4x-10+20=0
We add all the numbers together, and all the variables
2x+10=0
We move all terms containing x to the left, all other terms to the right
2x=-10
x=-10/2
x=-5
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