2x-10+90-(-3x)=180

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Solution for 2x-10+90-(-3x)=180 equation: 



2x-10+90-(-3x)=180

We move all terms to the left:

2x-10+90-(-3x)-(180)=0

We add all the numbers together, and all the variables

2x-(-3x)-100=0

We get rid of parentheses

2x+3x-100=0

We add all the numbers together, and all the variables

5x-100=0

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

5x=100

x=100/5

x=20

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