78=-5r-2(3r-6)

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Solution for 78=-5r-2(3r-6) equation:


Simplifying
78 = -5r + -2(3r + -6)

Reorder the terms:
78 = -5r + -2(-6 + 3r)
78 = -5r + (-6 * -2 + 3r * -2)
78 = -5r + (12 + -6r)

Reorder the terms:
78 = 12 + -5r + -6r

Combine like terms: -5r + -6r = -11r
78 = 12 + -11r

Solving
78 = 12 + -11r

Solving for variable 'r'.

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

Add '11r' to each side of the equation.
78 + 11r = 12 + -11r + 11r

Combine like terms: -11r + 11r = 0
78 + 11r = 12 + 0
78 + 11r = 12

Add '-78' to each side of the equation.
78 + -78 + 11r = 12 + -78

Combine like terms: 78 + -78 = 0
0 + 11r = 12 + -78
11r = 12 + -78

Combine like terms: 12 + -78 = -66
11r = -66

Divide each side by '11'.
r = -6

Simplifying
r = -6

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