x+(3x+100)=90

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Solution for x+(3x+100)=90 equation: 



x+(3x+100)=90

We move all terms to the left:

x+(3x+100)-(90)=0

We get rid of parentheses

x+3x+100-90=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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