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-1*2x+1=-9
We move all terms to the left:
-1*2x+1-(-9)=0
We add all the numbers together, and all the variables
-1*2x+10=0
Wy multiply elements
-2x+10=0
We move all terms containing x to the left, all other terms to the right
-2x=-10
x=-10/-2
x=+5
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