x+30+3x+2(3x+30)=990

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Solution for x+30+3x+2(3x+30)=990 equation: 



x+30+3x+2(3x+30)=990

We move all terms to the left:

x+30+3x+2(3x+30)-(990)=0

We add all the numbers together, and all the variables

4x+2(3x+30)-960=0

We multiply parentheses

4x+6x+60-960=0

We add all the numbers together, and all the variables

10x-900=0

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

10x=900

x=900/10

x=90

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