-155=r-3(5+7r)

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Solution for -155=r-3(5+7r) equation:


Simplifying
-155 = r + -3(5 + 7r)
-155 = r + (5 * -3 + 7r * -3)
-155 = r + (-15 + -21r)

Reorder the terms:
-155 = -15 + r + -21r

Combine like terms: r + -21r = -20r
-155 = -15 + -20r

Solving
-155 = -15 + -20r

Solving for variable 'r'.

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

Add '20r' to each side of the equation.
-155 + 20r = -15 + -20r + 20r

Combine like terms: -20r + 20r = 0
-155 + 20r = -15 + 0
-155 + 20r = -15

Add '155' to each side of the equation.
-155 + 155 + 20r = -15 + 155

Combine like terms: -155 + 155 = 0
0 + 20r = -15 + 155
20r = -15 + 155

Combine like terms: -15 + 155 = 140
20r = 140

Divide each side by '20'.
r = 7

Simplifying
r = 7

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