20+3(x)=90

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Solution for 20+3(x)=90 equation: 



20+3(x)=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-70=0

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

3x=70

x=70/3

x=23+1/3

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