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12.8x+10.5=14.5x-15
We move all terms to the left:
12.8x+10.5-(14.5x-15)=0
We get rid of parentheses
12.8x-14.5x+15+10.5=0
We add all the numbers together, and all the variables
-1.7x+25.5=0
We move all terms containing x to the left, all other terms to the right
-1.7x=-25.5
x=-25.5/-1.7
x=+15
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