40k+80=30k+90

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Solution for 40k+80=30k+90 equation:


Simplifying
40k + 80 = 30k + 90

Reorder the terms:
80 + 40k = 30k + 90

Reorder the terms:
80 + 40k = 90 + 30k

Solving
80 + 40k = 90 + 30k

Solving for variable 'k'.

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

Add '-30k' to each side of the equation.
80 + 40k + -30k = 90 + 30k + -30k

Combine like terms: 40k + -30k = 10k
80 + 10k = 90 + 30k + -30k

Combine like terms: 30k + -30k = 0
80 + 10k = 90 + 0
80 + 10k = 90

Add '-80' to each side of the equation.
80 + -80 + 10k = 90 + -80

Combine like terms: 80 + -80 = 0
0 + 10k = 90 + -80
10k = 90 + -80

Combine like terms: 90 + -80 = 10
10k = 10

Divide each side by '10'.
k = 1

Simplifying
k = 1

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