3x+4x+20=90

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Solution for 3x+4x+20=90 equation: 



3x+4x+20=90

We move all terms to the left:

3x+4x+20-(90)=0

We add all the numbers together, and all the variables

7x-70=0

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

7x=70

x=70/7

x=10

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