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-x-(-19x)=-18
We move all terms to the left:
-x-(-19x)-(-18)=0
We add all the numbers together, and all the variables
-1x-(-19x)+18=0
We get rid of parentheses
-1x+19x+18=0
We add all the numbers together, and all the variables
18x+18=0
We move all terms containing x to the left, all other terms to the right
18x=-18
x=-18/18
x=-1
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