5r+21=-(3-r)

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


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

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

Solving
21 + 5r = -3 + 1r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
21 + 5r + -1r = -3 + 1r + -1r

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

Combine like terms: 1r + -1r = 0
21 + 4r = -3 + 0
21 + 4r = -3

Add '-21' to each side of the equation.
21 + -21 + 4r = -3 + -21

Combine like terms: 21 + -21 = 0
0 + 4r = -3 + -21
4r = -3 + -21

Combine like terms: -3 + -21 = -24
4r = -24

Divide each side by '4'.
r = -6

Simplifying
r = -6

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