-7u+21=7(u-5)

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Solution for -7u+21=7(u-5) equation:


Simplifying
-7u + 21 = 7(u + -5)

Reorder the terms:
21 + -7u = 7(u + -5)

Reorder the terms:
21 + -7u = 7(-5 + u)
21 + -7u = (-5 * 7 + u * 7)
21 + -7u = (-35 + 7u)

Solving
21 + -7u = -35 + 7u

Solving for variable 'u'.

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

Add '-7u' to each side of the equation.
21 + -7u + -7u = -35 + 7u + -7u

Combine like terms: -7u + -7u = -14u
21 + -14u = -35 + 7u + -7u

Combine like terms: 7u + -7u = 0
21 + -14u = -35 + 0
21 + -14u = -35

Add '-21' to each side of the equation.
21 + -21 + -14u = -35 + -21

Combine like terms: 21 + -21 = 0
0 + -14u = -35 + -21
-14u = -35 + -21

Combine like terms: -35 + -21 = -56
-14u = -56

Divide each side by '-14'.
u = 4

Simplifying
u = 4

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