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(28x-18)+(21x+8)=8
We move all terms to the left:
(28x-18)+(21x+8)-(8)=0
We get rid of parentheses
28x+21x-18+8-8=0
We add all the numbers together, and all the variables
49x-18=0
We move all terms containing x to the left, all other terms to the right
49x=18
x=18/49
x=18/49
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