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166=-2(-5+2x)-9x
We move all terms to the left:
166-(-2(-5+2x)-9x)=0
We add all the numbers together, and all the variables
-(-2(2x-5)-9x)+166=0
We calculate terms in parentheses: -(-2(2x-5)-9x), so:We get rid of parentheses
-2(2x-5)-9x
We add all the numbers together, and all the variables
-9x-2(2x-5)
We multiply parentheses
-9x-4x+10
We add all the numbers together, and all the variables
-13x+10
Back to the equation:
-(-13x+10)
13x-10+166=0
We add all the numbers together, and all the variables
13x+156=0
We move all terms containing x to the left, all other terms to the right
13x=-156
x=-156/13
x=-12
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