Divide using synthetic division.(7x+x-8)+(x-1)(7x+x-8) + (x-1)=0(Simplify your answer. Use integers or fractions for any numbers in the expression. Do not factor.)

Divide using synthetic division.(7x²+x-8)+(x-1)(7x²+x-8) + (x-1)=0(Simplify your answer. Use integers or fractions for any numbers in the expression. Do not factor.)