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-5x+4(-2-7)=-171
We move all terms to the left:
-5x+4(-2-7)-(-171)=0
We add all the numbers together, and all the variables
-5x+4(-9)-(-171)=0
We add all the numbers together, and all the variables
-5x+135=0
We move all terms containing x to the left, all other terms to the right
-5x=-135
x=-135/-5
x=+27
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