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

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


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

Reorder the terms:
9r + -3(5 + r) = 4(2r + -5) + -9
9r + (5 * -3 + r * -3) = 4(2r + -5) + -9
9r + (-15 + -3r) = 4(2r + -5) + -9

Reorder the terms:
-15 + 9r + -3r = 4(2r + -5) + -9

Combine like terms: 9r + -3r = 6r
-15 + 6r = 4(2r + -5) + -9

Reorder the terms:
-15 + 6r = 4(-5 + 2r) + -9
-15 + 6r = (-5 * 4 + 2r * 4) + -9
-15 + 6r = (-20 + 8r) + -9

Reorder the terms:
-15 + 6r = -20 + -9 + 8r

Combine like terms: -20 + -9 = -29
-15 + 6r = -29 + 8r

Solving
-15 + 6r = -29 + 8r

Solving for variable 'r'.

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

Add '-8r' to each side of the equation.
-15 + 6r + -8r = -29 + 8r + -8r

Combine like terms: 6r + -8r = -2r
-15 + -2r = -29 + 8r + -8r

Combine like terms: 8r + -8r = 0
-15 + -2r = -29 + 0
-15 + -2r = -29

Add '15' to each side of the equation.
-15 + 15 + -2r = -29 + 15

Combine like terms: -15 + 15 = 0
0 + -2r = -29 + 15
-2r = -29 + 15

Combine like terms: -29 + 15 = -14
-2r = -14

Divide each side by '-2'.
r = 7

Simplifying
r = 7

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