Question

how to solve -2(1-7n)-5n=34

Answer 1

-2(1-7n)-5n=34

Multiply the bracket by -2

(-2)(1)=-2

(-2)(-7n)=14n

-2+14n-5n=34

-2+9n=34

Move -2 to the other side. Sign changes from -2 to +2.

-2+2+9n=34+2

9n=34+2

9n=36

Divide by 9 for both sides

9n/9=36/9

n=4

Answer: n=4

Answer 2

-2(1-7n)-5n=34

distributive property

-2+14n-5n=34

combine like terms

-2+9n=34

+2       +2

9n=36

÷9   ÷9

n=4