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2x+4(-1/2x+7)=-12
We move all terms to the left:
2x+4(-1/2x+7)-(-12)=0
Domain of the equation: 2x+7)!=0We add all the numbers together, and all the variables
x∈R
2x+4(-1/2x+7)+12=0
We multiply parentheses
2x-4x+28+12=0
We add all the numbers together, and all the variables
-2x+40=0
We move all terms containing x to the left, all other terms to the right
-2x=-40
x=-40/-2
x=+20
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