3r-(4r-5)=21

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


Simplifying
3r + -1(4r + -5) = 21

Reorder the terms:
3r + -1(-5 + 4r) = 21
3r + (-5 * -1 + 4r * -1) = 21
3r + (5 + -4r) = 21

Reorder the terms:
5 + 3r + -4r = 21

Combine like terms: 3r + -4r = -1r
5 + -1r = 21

Solving
5 + -1r = 21

Solving for variable 'r'.

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

Add '-5' to each side of the equation.
5 + -5 + -1r = 21 + -5

Combine like terms: 5 + -5 = 0
0 + -1r = 21 + -5
-1r = 21 + -5

Combine like terms: 21 + -5 = 16
-1r = 16

Divide each side by '-1'.
r = -16

Simplifying
r = -16

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