-87=7+2(-7-5r)

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Solution for -87=7+2(-7-5r) equation:


Simplifying
-87 = 7 + 2(-7 + -5r)
-87 = 7 + (-7 * 2 + -5r * 2)
-87 = 7 + (-14 + -10r)

Combine like terms: 7 + -14 = -7
-87 = -7 + -10r

Solving
-87 = -7 + -10r

Solving for variable 'r'.

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

Add '10r' to each side of the equation.
-87 + 10r = -7 + -10r + 10r

Combine like terms: -10r + 10r = 0
-87 + 10r = -7 + 0
-87 + 10r = -7

Add '87' to each side of the equation.
-87 + 87 + 10r = -7 + 87

Combine like terms: -87 + 87 = 0
0 + 10r = -7 + 87
10r = -7 + 87

Combine like terms: -7 + 87 = 80
10r = 80

Divide each side by '10'.
r = 8

Simplifying
r = 8

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