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-1-7x-6\left(-7-x\right)=36
To find the opposite of 1+7x, find the opposite of each term.
-1-7x+42+6x=36
Use the distributive property to multiply -6 by -7-x.
41-7x+6x=36
Add -1 and 42 to get 41.
41-x=36
Combine -7x and 6x to get -x.
-x=36-41
Subtract 41 from both sides.
-x=-5
Subtract 41 from 36 to get -5.
x=5
Multiply both sides by -1.