Question

I need to know full solution

Answer 1

Answer:-10

1. Make equation:

X + 17 + X + 20 = 17

2. Short the equation:

2x + 17 + 20 = 17

3. Make numbers to the left side, without forgetting to change sign:

2x = 17-17-20
2x = -20 |:2
x = -10

Proof: (Solving equation)
(-10)+17+(-10)+20 =
(-10)+17-10+20 =
7-10+20 = -3+20 = 17

So the answer is -10

Answer 2

QR = 7

Explanation:

x + 17 + x + 20 = 17

2x + 37 = 17

2x = 17 - 37

2x = -20

x = -10

QR = x + 17

QR = -10 + 17

QR = 7