9*42=(9*40)+(9*k)

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Solution for 9*42=(9*40)+(9*k) equation:


Simplifying
9 * 42 = (9 * 40) + (9k)

Multiply 9 * 42
378 = (9 * 40) + (9k)

Multiply 9 * 40
378 = (360) + (9k)
378 = 360 + (9k)

Solving
378 = 360 + (9k)

Solving for variable 'k'.

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

Add '(-9k)' to each side of the equation.
378 + (-9k) = 360 + (9k) + (-9k)

Combine like terms: (9k) + (-9k) = 0
378 + (-9k) = 360 + 0
378 + (-9k) = 360

Add '-378' to each side of the equation.
378 + -378 + (-9k) = 360 + -378

Combine like terms: 378 + -378 = 0
0 + (-9k) = 360 + -378
(-9k) = 360 + -378

Combine like terms: 360 + -378 = -18
(-9k) = -18

Divide each side by '-9'.
k = 2

Simplifying
k = 2

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