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(x+4)+(x+3x)=90
We move all terms to the left:
(x+4)+(x+3x)-(90)=0
We add all the numbers together, and all the variables
(x+4)+(+4x)-90=0
We get rid of parentheses
x+4x+4-90=0
We add all the numbers together, and all the variables
5x-86=0
We move all terms containing x to the left, all other terms to the right
5x=86
x=86/5
x=17+1/5
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