90=7s+8s

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Solution for 90=7s+8s equation:


Simplifying
90 = 7s + 8s

Combine like terms: 7s + 8s = 15s
90 = 15s

Solving
90 = 15s

Solving for variable 's'.

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

Add '-15s' to each side of the equation.
90 + -15s = 15s + -15s

Combine like terms: 15s + -15s = 0
90 + -15s = 0

Add '-90' to each side of the equation.
90 + -90 + -15s = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -15s = 0 + -90
-15s = 0 + -90

Combine like terms: 0 + -90 = -90
-15s = -90

Divide each side by '-15'.
s = 6

Simplifying
s = 6

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