9r-4(r+2)=5(2r-4)-18

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Solution for 9r-4(r+2)=5(2r-4)-18 equation:


Simplifying
9r + -4(r + 2) = 5(2r + -4) + -18

Reorder the terms:
9r + -4(2 + r) = 5(2r + -4) + -18
9r + (2 * -4 + r * -4) = 5(2r + -4) + -18
9r + (-8 + -4r) = 5(2r + -4) + -18

Reorder the terms:
-8 + 9r + -4r = 5(2r + -4) + -18

Combine like terms: 9r + -4r = 5r
-8 + 5r = 5(2r + -4) + -18

Reorder the terms:
-8 + 5r = 5(-4 + 2r) + -18
-8 + 5r = (-4 * 5 + 2r * 5) + -18
-8 + 5r = (-20 + 10r) + -18

Reorder the terms:
-8 + 5r = -20 + -18 + 10r

Combine like terms: -20 + -18 = -38
-8 + 5r = -38 + 10r

Solving
-8 + 5r = -38 + 10r

Solving for variable 'r'.

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

Add '-10r' to each side of the equation.
-8 + 5r + -10r = -38 + 10r + -10r

Combine like terms: 5r + -10r = -5r
-8 + -5r = -38 + 10r + -10r

Combine like terms: 10r + -10r = 0
-8 + -5r = -38 + 0
-8 + -5r = -38

Add '8' to each side of the equation.
-8 + 8 + -5r = -38 + 8

Combine like terms: -8 + 8 = 0
0 + -5r = -38 + 8
-5r = -38 + 8

Combine like terms: -38 + 8 = -30
-5r = -30

Divide each side by '-5'.
r = 6

Simplifying
r = 6

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