Answer :
First, use communitive property:
6x+8+7=-29 Now you add together the like terms; 8+7
6x+15=-29 After adding, write like previously, but replace 8 and 7 with 15
Then, subtract the 15, on both sides:
6x+15=-29 What we got earlier, now subtract the 15, on both sides
6x=-44 After subtracting 15
Then, divide:
6x=-44 What we got earlier, now divide each side by 6, isolate the variable
x=-44/6 Simplify, convert if needed
x=-22/3, -7.333333333 repeating, -7 1/3
Your answer is: x=-22/3, -7.33333333 repeating, -7 1/3
Hope that helps!