x-15+x+3=90

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



x-15+x+3=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-102=0

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

2x=102

x=102/2

x=51

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