3x-15+45-x=90

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Solution for 3x-15+45-x=90 equation: 



3x-15+45-x=90

We move all terms to the left:

3x-15+45-x-(90)=0

We add all the numbers together, and all the variables

2x-60=0

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

2x=60

x=60/2

x=30

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