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15x-20=28+3x
We move all terms to the left:
15x-20-(28+3x)=0
We add all the numbers together, and all the variables
15x-(3x+28)-20=0
We get rid of parentheses
15x-3x-28-20=0
We add all the numbers together, and all the variables
12x-48=0
We move all terms containing x to the left, all other terms to the right
12x=48
x=48/12
x=4
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