-15=3u+7(u+5)

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Solution for -15=3u+7(u+5) equation:


Simplifying
-15 = 3u + 7(u + 5)

Reorder the terms:
-15 = 3u + 7(5 + u)
-15 = 3u + (5 * 7 + u * 7)
-15 = 3u + (35 + 7u)

Reorder the terms:
-15 = 35 + 3u + 7u

Combine like terms: 3u + 7u = 10u
-15 = 35 + 10u

Solving
-15 = 35 + 10u

Solving for variable 'u'.

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

Add '-10u' to each side of the equation.
-15 + -10u = 35 + 10u + -10u

Combine like terms: 10u + -10u = 0
-15 + -10u = 35 + 0
-15 + -10u = 35

Add '15' to each side of the equation.
-15 + 15 + -10u = 35 + 15

Combine like terms: -15 + 15 = 0
0 + -10u = 35 + 15
-10u = 35 + 15

Combine like terms: 35 + 15 = 50
-10u = 50

Divide each side by '-10'.
u = -5

Simplifying
u = -5

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