7(10-3k)=5(15-4k)

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Solution for 7(10-3k)=5(15-4k) equation:


Simplifying
7(10 + -3k) = 5(15 + -4k)
(10 * 7 + -3k * 7) = 5(15 + -4k)
(70 + -21k) = 5(15 + -4k)
70 + -21k = (15 * 5 + -4k * 5)
70 + -21k = (75 + -20k)

Solving
70 + -21k = 75 + -20k

Solving for variable 'k'.

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

Add '20k' to each side of the equation.
70 + -21k + 20k = 75 + -20k + 20k

Combine like terms: -21k + 20k = -1k
70 + -1k = 75 + -20k + 20k

Combine like terms: -20k + 20k = 0
70 + -1k = 75 + 0
70 + -1k = 75

Add '-70' to each side of the equation.
70 + -70 + -1k = 75 + -70

Combine like terms: 70 + -70 = 0
0 + -1k = 75 + -70
-1k = 75 + -70

Combine like terms: 75 + -70 = 5
-1k = 5

Divide each side by '-1'.
k = -5

Simplifying
k = -5

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