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x-0.10x+2.5=45.5
We move all terms to the left:
x-0.10x+2.5-(45.5)=0
We add all the numbers together, and all the variables
0.9x-43=0
We move all terms containing x to the left, all other terms to the right
0.9x=43
x=43/0.9
x=47+0.7/0.9
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