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4x+(x+5)=90
We move all terms to the left:
4x+(x+5)-(90)=0
We get rid of parentheses
4x+x+5-90=0
We add all the numbers together, and all the variables
5x-85=0
We move all terms containing x to the left, all other terms to the right
5x=85
x=85/5
x=17
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