10r-3(r+3)=3(3r-3)-12

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Solution for 10r-3(r+3)=3(3r-3)-12 equation:


Simplifying
10r + -3(r + 3) = 3(3r + -3) + -12

Reorder the terms:
10r + -3(3 + r) = 3(3r + -3) + -12
10r + (3 * -3 + r * -3) = 3(3r + -3) + -12
10r + (-9 + -3r) = 3(3r + -3) + -12

Reorder the terms:
-9 + 10r + -3r = 3(3r + -3) + -12

Combine like terms: 10r + -3r = 7r
-9 + 7r = 3(3r + -3) + -12

Reorder the terms:
-9 + 7r = 3(-3 + 3r) + -12
-9 + 7r = (-3 * 3 + 3r * 3) + -12
-9 + 7r = (-9 + 9r) + -12

Reorder the terms:
-9 + 7r = -9 + -12 + 9r

Combine like terms: -9 + -12 = -21
-9 + 7r = -21 + 9r

Solving
-9 + 7r = -21 + 9r

Solving for variable 'r'.

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

Add '-9r' to each side of the equation.
-9 + 7r + -9r = -21 + 9r + -9r

Combine like terms: 7r + -9r = -2r
-9 + -2r = -21 + 9r + -9r

Combine like terms: 9r + -9r = 0
-9 + -2r = -21 + 0
-9 + -2r = -21

Add '9' to each side of the equation.
-9 + 9 + -2r = -21 + 9

Combine like terms: -9 + 9 = 0
0 + -2r = -21 + 9
-2r = -21 + 9

Combine like terms: -21 + 9 = -12
-2r = -12

Divide each side by '-2'.
r = 6

Simplifying
r = 6

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