1/4 × s = 15
s = 15 : 1/4
s = 15 × 4
s = 60
Variable s cannot be equal to 0 as division by zero is not defined. Multiply both sides of the equation by 4s.
Swap sides so that all variable terms are on the left-hand side.
Divide both sides by 60.
__________
Hope it helps.
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