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2x+103=7x+28
We move all terms to the left:
2x+103-(7x+28)=0
We get rid of parentheses
2x-7x-28+103=0
We add all the numbers together, and all the variables
-5x+75=0
We move all terms containing x to the left, all other terms to the right
-5x=-75
x=-75/-5
x=+15
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