21+5r=4(9r+7)

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Solution for 21+5r=4(9r+7) equation:


Simplifying
21 + 5r = 4(9r + 7)

Reorder the terms:
21 + 5r = 4(7 + 9r)
21 + 5r = (7 * 4 + 9r * 4)
21 + 5r = (28 + 36r)

Solving
21 + 5r = 28 + 36r

Solving for variable 'r'.

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

Add '-36r' to each side of the equation.
21 + 5r + -36r = 28 + 36r + -36r

Combine like terms: 5r + -36r = -31r
21 + -31r = 28 + 36r + -36r

Combine like terms: 36r + -36r = 0
21 + -31r = 28 + 0
21 + -31r = 28

Add '-21' to each side of the equation.
21 + -21 + -31r = 28 + -21

Combine like terms: 21 + -21 = 0
0 + -31r = 28 + -21
-31r = 28 + -21

Combine like terms: 28 + -21 = 7
-31r = 7

Divide each side by '-31'.
r = -0.2258064516

Simplifying
r = -0.2258064516

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