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90=2(2+5x)+1
We move all terms to the left:
90-(2(2+5x)+1)=0
We add all the numbers together, and all the variables
-(2(5x+2)+1)+90=0
We calculate terms in parentheses: -(2(5x+2)+1), so:We get rid of parentheses
2(5x+2)+1
We multiply parentheses
10x+4+1
We add all the numbers together, and all the variables
10x+5
Back to the equation:
-(10x+5)
-10x-5+90=0
We add all the numbers together, and all the variables
-10x+85=0
We move all terms containing x to the left, all other terms to the right
-10x=-85
x=-85/-10
x=8+1/2
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