-100=-6r-7(r+5)

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Solution for -100=-6r-7(r+5) equation:


Simplifying
-100 = -6r + -7(r + 5)

Reorder the terms:
-100 = -6r + -7(5 + r)
-100 = -6r + (5 * -7 + r * -7)
-100 = -6r + (-35 + -7r)

Reorder the terms:
-100 = -35 + -6r + -7r

Combine like terms: -6r + -7r = -13r
-100 = -35 + -13r

Solving
-100 = -35 + -13r

Solving for variable 'r'.

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

Add '13r' to each side of the equation.
-100 + 13r = -35 + -13r + 13r

Combine like terms: -13r + 13r = 0
-100 + 13r = -35 + 0
-100 + 13r = -35

Add '100' to each side of the equation.
-100 + 100 + 13r = -35 + 100

Combine like terms: -100 + 100 = 0
0 + 13r = -35 + 100
13r = -35 + 100

Combine like terms: -35 + 100 = 65
13r = 65

Divide each side by '13'.
r = 5

Simplifying
r = 5

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