3x+90+x=80

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Solution for 3x+90+x=80 equation: 



3x+90+x=80

We move all terms to the left:

3x+90+x-(80)=0

We add all the numbers together, and all the variables

4x+10=0

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

4x=-10

x=-10/4

x=-2+1/2

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