3(r-6)+6=4(r+2)-21

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Solution for 3(r-6)+6=4(r+2)-21 equation: 


Simplifying
3(r + -6) + 6 = 4(r + 2) + -21

Reorder the terms:
3(-6 + r) + 6 = 4(r + 2) + -21
(-6 * 3 + r * 3) + 6 = 4(r + 2) + -21
(-18 + 3r) + 6 = 4(r + 2) + -21

Reorder the terms:
-18 + 6 + 3r = 4(r + 2) + -21

Combine like terms: -18 + 6 = -12
-12 + 3r = 4(r + 2) + -21

Reorder the terms:
-12 + 3r = 4(2 + r) + -21
-12 + 3r = (2 * 4 + r * 4) + -21
-12 + 3r = (8 + 4r) + -21

Reorder the terms:
-12 + 3r = 8 + -21 + 4r

Combine like terms: 8 + -21 = -13
-12 + 3r = -13 + 4r

Solving
-12 + 3r = -13 + 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.
-12 + 3r + -4r = -13 + 4r + -4r

Combine like terms: 3r + -4r = -1r
-12 + -1r = -13 + 4r + -4r

Combine like terms: 4r + -4r = 0
-12 + -1r = -13 + 0
-12 + -1r = -13

Add '12' to each side of the equation.
-12 + 12 + -1r = -13 + 12

Combine like terms: -12 + 12 = 0
0 + -1r = -13 + 12
-1r = -13 + 12

Combine like terms: -13 + 12 = -1
-1r = -1

Divide each side by '-1'.
r = 1

Simplifying
r = 1

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