-9(r-2)=4(r-15)

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Solution for -9(r-2)=4(r-15) equation:


Simplifying
-9(r + -2) = 4(r + -15)

Reorder the terms:
-9(-2 + r) = 4(r + -15)
(-2 * -9 + r * -9) = 4(r + -15)
(18 + -9r) = 4(r + -15)

Reorder the terms:
18 + -9r = 4(-15 + r)
18 + -9r = (-15 * 4 + r * 4)
18 + -9r = (-60 + 4r)

Solving
18 + -9r = -60 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
18 + -9r + -4r = -60 + 4r + -4r

Combine like terms: -9r + -4r = -13r
18 + -13r = -60 + 4r + -4r

Combine like terms: 4r + -4r = 0
18 + -13r = -60 + 0
18 + -13r = -60

Add '-18' to each side of the equation.
18 + -18 + -13r = -60 + -18

Combine like terms: 18 + -18 = 0
0 + -13r = -60 + -18
-13r = -60 + -18

Combine like terms: -60 + -18 = -78
-13r = -78

Divide each side by '-13'.
r = 6

Simplifying
r = 6

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