Solve for x

X=20-y

7x-8=y

x = 3.5

Step-by-step explanation:

Substitute the variable x with what it's equal to, x = 20-y

7 (20-y) - 8 = y

Distribute into the parenthesis.

140-7y-8 = y

Subtract common numbers.

(140-8) - 7y = y

132-7y = y

Move the constant to the right.

132-7y = y

-132 - 132

-7y = y-132

Subtract y to both sides.

-7y = y-132

-y - y

-8y = - 132

Divide to both sides by - 8

-8y = - 132

-8 - 8

y = 16.5

Now, add the y value to the equation.

x = 20 - (16.5)

x = 3.5