157=3(5+7r)-5

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Solution for 157=3(5+7r)-5 equation:


Simplifying
157 = 3(5 + 7r) + -5
157 = (5 * 3 + 7r * 3) + -5
157 = (15 + 21r) + -5

Reorder the terms:
157 = 15 + -5 + 21r

Combine like terms: 15 + -5 = 10
157 = 10 + 21r

Solving
157 = 10 + 21r

Solving for variable 'r'.

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

Add '-21r' to each side of the equation.
157 + -21r = 10 + 21r + -21r

Combine like terms: 21r + -21r = 0
157 + -21r = 10 + 0
157 + -21r = 10

Add '-157' to each side of the equation.
157 + -157 + -21r = 10 + -157

Combine like terms: 157 + -157 = 0
0 + -21r = 10 + -157
-21r = 10 + -157

Combine like terms: 10 + -157 = -147
-21r = -147

Divide each side by '-21'.
r = 7

Simplifying
r = 7

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