-(1+7x)-6(-7-x)=36

-(1+7x)-6(-7-x)=36

-1(1) +(-1)(7x) - 6(-7) (6)(-1x)=36

-1 -7x +42-6x=36

-7x-6x -1+42 =36

-13x+41=36

-13x+41-41=36-41

-13x=-5

-13x/-13=-5/-13

x=5/13