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4.2x+2.5(-3)=2.5
We move all terms to the left:
4.2x+2.5(-3)-(2.5)=0
We add all the numbers together, and all the variables
4.2x-10=0
We move all terms containing x to the left, all other terms to the right
4.2x=10
x=10/4.2
x=2+1/2.625
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