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

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


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

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

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

Combine like terms: -18 + 2 = -16
-16 + 3r = 4(r + 2) * 21

Reorder the terms:
-16 + 3r = 4(2 + r) * 21

Reorder the terms for easier multiplication:
-16 + 3r = 4 * 21(2 + r)

Multiply 4 * 21
-16 + 3r = 84(2 + r)
-16 + 3r = (2 * 84 + r * 84)
-16 + 3r = (168 + 84r)

Solving
-16 + 3r = 168 + 84r

Solving for variable 'r'.

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

Add '-84r' to each side of the equation.
-16 + 3r + -84r = 168 + 84r + -84r

Combine like terms: 3r + -84r = -81r
-16 + -81r = 168 + 84r + -84r

Combine like terms: 84r + -84r = 0
-16 + -81r = 168 + 0
-16 + -81r = 168

Add '16' to each side of the equation.
-16 + 16 + -81r = 168 + 16

Combine like terms: -16 + 16 = 0
0 + -81r = 168 + 16
-81r = 168 + 16

Combine like terms: 168 + 16 = 184
-81r = 184

Divide each side by '-81'.
r = -2.271604938

Simplifying
r = -2.271604938

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