21-5r=3(7r-3)+4

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Solution for 21-5r=3(7r-3)+4 equation:


Simplifying
21 + -5r = 3(7r + -3) + 4

Reorder the terms:
21 + -5r = 3(-3 + 7r) + 4
21 + -5r = (-3 * 3 + 7r * 3) + 4
21 + -5r = (-9 + 21r) + 4

Reorder the terms:
21 + -5r = -9 + 4 + 21r

Combine like terms: -9 + 4 = -5
21 + -5r = -5 + 21r

Solving
21 + -5r = -5 + 21r

Solving for variable 'r'.

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

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

Combine like terms: -5r + -21r = -26r
21 + -26r = -5 + 21r + -21r

Combine like terms: 21r + -21r = 0
21 + -26r = -5 + 0
21 + -26r = -5

Add '-21' to each side of the equation.
21 + -21 + -26r = -5 + -21

Combine like terms: 21 + -21 = 0
0 + -26r = -5 + -21
-26r = -5 + -21

Combine like terms: -5 + -21 = -26
-26r = -26

Divide each side by '-26'.
r = 1

Simplifying
r = 1

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