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4x+1+3x+25.9=90
We move all terms to the left:
4x+1+3x+25.9-(90)=0
We add all the numbers together, and all the variables
7x-63.1=0
We move all terms containing x to the left, all other terms to the right
7x=63.1
x=63.1/7
x=9+0.1/7
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