3x+6+7=90

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Solution for 3x+6+7=90 equation: 



3x+6+7=90

We move all terms to the left:

3x+6+7-(90)=0

We add all the numbers together, and all the variables

3x-77=0

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

3x=77

x=77/3

x=25+2/3

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