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5(-x)-3(-x)+3=12+(-x)
We move all terms to the left:
5(-x)-3(-x)+3-(12+(-x))=0
We add all the numbers together, and all the variables
5(-1x)-3(-1x)-(12+(-1x))+3=0
We multiply parentheses
-5x+3x-(12+(-1x))+3=0
We calculate terms in parentheses: -(12+(-1x)), so:We add all the numbers together, and all the variables
12+(-1x)
determiningTheFunctionDomain (-1x)+12
We get rid of parentheses
-1x+12
Back to the equation:
-(-1x+12)
-2x-(-1x+12)+3=0
We get rid of parentheses
-2x+1x-12+3=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
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