5x+2x=90+2x

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Solution for 5x+2x=90+2x equation: 



5x+2x=90+2x

We move all terms to the left:

5x+2x-(90+2x)=0

We add all the numbers together, and all the variables

5x+2x-(2x+90)=0

We add all the numbers together, and all the variables

7x-(2x+90)=0

We get rid of parentheses

7x-2x-90=0

We add all the numbers together, and all the variables

5x-90=0

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

5x=90

x=90/5

x=18

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