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19x-15x-(-6x)-20x=-40
We move all terms to the left:
19x-15x-(-6x)-20x-(-40)=0
We add all the numbers together, and all the variables
-16x-(-6x)+40=0
We get rid of parentheses
-16x+6x+40=0
We add all the numbers together, and all the variables
-10x+40=0
We move all terms containing x to the left, all other terms to the right
-10x=-40
x=-40/-10
x=+4
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