x-21+2x-15=90

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Solution for x-21+2x-15=90 equation: 



x-21+2x-15=90

We move all terms to the left:

x-21+2x-15-(90)=0

We add all the numbers together, and all the variables

3x-126=0

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

3x=126

x=126/3

x=42

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