-31=3(u-7)-5u

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Solution for -31=3(u-7)-5u equation:


Simplifying
-31 = 3(u + -7) + -5u

Reorder the terms:
-31 = 3(-7 + u) + -5u
-31 = (-7 * 3 + u * 3) + -5u
-31 = (-21 + 3u) + -5u

Combine like terms: 3u + -5u = -2u
-31 = -21 + -2u

Solving
-31 = -21 + -2u

Solving for variable 'u'.

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

Add '2u' to each side of the equation.
-31 + 2u = -21 + -2u + 2u

Combine like terms: -2u + 2u = 0
-31 + 2u = -21 + 0
-31 + 2u = -21

Add '31' to each side of the equation.
-31 + 31 + 2u = -21 + 31

Combine like terms: -31 + 31 = 0
0 + 2u = -21 + 31
2u = -21 + 31

Combine like terms: -21 + 31 = 10
2u = 10

Divide each side by '2'.
u = 5

Simplifying
u = 5

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