21+30+3x=90

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Solution for 21+30+3x=90 equation: 



21+30+3x=90

We move all terms to the left:

21+30+3x-(90)=0

We add all the numbers together, and all the variables

3x-39=0

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

3x=39

x=39/3

x=13

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