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103=4x+3
We move all terms to the left:
103-(4x+3)=0
We get rid of parentheses
-4x-3+103=0
We add all the numbers together, and all the variables
-4x+100=0
We move all terms containing x to the left, all other terms to the right
-4x=-100
x=-100/-4
x=+25
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