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-x-3x=-10+3
We move all terms to the left:
-x-3x-(-10+3)=0
We add all the numbers together, and all the variables
-x-3x-(-7)=0
We add all the numbers together, and all the variables
-4x+7=0
We move all terms containing x to the left, all other terms to the right
-4x=-7
x=-7/-4
x=1+3/4
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