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4.2+3.4x-1.5-2.5x=15.3
We move all terms to the left:
4.2+3.4x-1.5-2.5x-(15.3)=0
We add all the numbers together, and all the variables
0.9x-12.6=0
We move all terms containing x to the left, all other terms to the right
0.9x=12.6
x=12.6/0.9
x=14
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