28+42=u

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Solution for 28+42=u equation:


Simplifying
28 + 42 = u

Combine like terms: 28 + 42 = 70
70 = u

Solving
70 = u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
70 + -1u = u + -1u

Combine like terms: u + -1u = 0
70 + -1u = 0

Add '-70' to each side of the equation.
70 + -70 + -1u = 0 + -70

Combine like terms: 70 + -70 = 0
0 + -1u = 0 + -70
-1u = 0 + -70

Combine like terms: 0 + -70 = -70
-1u = -70

Divide each side by '-1'.
u = 70

Simplifying
u = 70

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