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3x+4=2.5x+3.5
We move all terms to the left:
3x+4-(2.5x+3.5)=0
We get rid of parentheses
3x-2.5x-3.5+4=0
We add all the numbers together, and all the variables
0.5x+0.5=0
We move all terms containing x to the left, all other terms to the right
0.5x=-0.5
x=-0.5/0.5
x=-1
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