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-40x-(5+6x)*2=42
We move all terms to the left:
-40x-(5+6x)*2-(42)=0
We add all the numbers together, and all the variables
-40x-(6x+5)*2-42=0
We multiply parentheses
-40x-12x-10-42=0
We add all the numbers together, and all the variables
-52x-52=0
We move all terms containing x to the left, all other terms to the right
-52x=52
x=52/-52
x=-1
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