4+8(-2r-15)=20-7r+17

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Solution for 4+8(-2r-15)=20-7r+17 equation:


Simplifying
4 + 8(-2r + -15) = 20 + -7r + 17

Reorder the terms:
4 + 8(-15 + -2r) = 20 + -7r + 17
4 + (-15 * 8 + -2r * 8) = 20 + -7r + 17
4 + (-120 + -16r) = 20 + -7r + 17

Combine like terms: 4 + -120 = -116
-116 + -16r = 20 + -7r + 17

Reorder the terms:
-116 + -16r = 20 + 17 + -7r

Combine like terms: 20 + 17 = 37
-116 + -16r = 37 + -7r

Solving
-116 + -16r = 37 + -7r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '7r' to each side of the equation.
-116 + -16r + 7r = 37 + -7r + 7r

Combine like terms: -16r + 7r = -9r
-116 + -9r = 37 + -7r + 7r

Combine like terms: -7r + 7r = 0
-116 + -9r = 37 + 0
-116 + -9r = 37

Add '116' to each side of the equation.
-116 + 116 + -9r = 37 + 116

Combine like terms: -116 + 116 = 0
0 + -9r = 37 + 116
-9r = 37 + 116

Combine like terms: 37 + 116 = 153
-9r = 153

Divide each side by '-9'.
r = -17

Simplifying
r = -17

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