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(-12+8x)(-10)=280
We move all terms to the left:
(-12+8x)(-10)-(280)=0
We add all the numbers together, and all the variables
(8x-12)(-10)-280=0
We multiply parentheses ..
(-80x+120)-280=0
We get rid of parentheses
-80x+120-280=0
We add all the numbers together, and all the variables
-80x-160=0
We move all terms containing x to the left, all other terms to the right
-80x=160
x=160/-80
x=-2
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