x-42+x-42=90

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Solution for x-42+x-42=90 equation: 



x-42+x-42=90

We move all terms to the left:

x-42+x-42-(90)=0

We add all the numbers together, and all the variables

2x-174=0

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

2x=174

x=174/2

x=87

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