-28=-(r-4)+7(7+4r)

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Solution for -28=-(r-4)+7(7+4r) equation:


Simplifying
-28 = -1(r + -4) + 7(7 + 4r)

Reorder the terms:
-28 = -1(-4 + r) + 7(7 + 4r)
-28 = (-4 * -1 + r * -1) + 7(7 + 4r)
-28 = (4 + -1r) + 7(7 + 4r)
-28 = 4 + -1r + (7 * 7 + 4r * 7)
-28 = 4 + -1r + (49 + 28r)

Reorder the terms:
-28 = 4 + 49 + -1r + 28r

Combine like terms: 4 + 49 = 53
-28 = 53 + -1r + 28r

Combine like terms: -1r + 28r = 27r
-28 = 53 + 27r

Solving
-28 = 53 + 27r

Solving for variable 'r'.

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

Add '-27r' to each side of the equation.
-28 + -27r = 53 + 27r + -27r

Combine like terms: 27r + -27r = 0
-28 + -27r = 53 + 0
-28 + -27r = 53

Add '28' to each side of the equation.
-28 + 28 + -27r = 53 + 28

Combine like terms: -28 + 28 = 0
0 + -27r = 53 + 28
-27r = 53 + 28

Combine like terms: 53 + 28 = 81
-27r = 81

Divide each side by '-27'.
r = -3

Simplifying
r = -3

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