20-x+15+3x=90

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Solution for 20-x+15+3x=90 equation: 



20-x+15+3x=90

We move all terms to the left:

20-x+15+3x-(90)=0

We add all the numbers together, and all the variables

2x-55=0

We move all terms containing x to the left, all other terms to the right

2x=55

x=55/2

x=27+1/2

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