9r-2(r+4)=4(3r-5)-18

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Solution for 9r-2(r+4)=4(3r-5)-18 equation:


Simplifying
9r + -2(r + 4) = 4(3r + -5) + -18

Reorder the terms:
9r + -2(4 + r) = 4(3r + -5) + -18
9r + (4 * -2 + r * -2) = 4(3r + -5) + -18
9r + (-8 + -2r) = 4(3r + -5) + -18

Reorder the terms:
-8 + 9r + -2r = 4(3r + -5) + -18

Combine like terms: 9r + -2r = 7r
-8 + 7r = 4(3r + -5) + -18

Reorder the terms:
-8 + 7r = 4(-5 + 3r) + -18
-8 + 7r = (-5 * 4 + 3r * 4) + -18
-8 + 7r = (-20 + 12r) + -18

Reorder the terms:
-8 + 7r = -20 + -18 + 12r

Combine like terms: -20 + -18 = -38
-8 + 7r = -38 + 12r

Solving
-8 + 7r = -38 + 12r

Solving for variable 'r'.

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

Add '-12r' to each side of the equation.
-8 + 7r + -12r = -38 + 12r + -12r

Combine like terms: 7r + -12r = -5r
-8 + -5r = -38 + 12r + -12r

Combine like terms: 12r + -12r = 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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