Question 971765
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{{{1/s+1/p=1/g}}} Find common denominator on left.
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{{{(1/s)(p/p)+(1/p)(s/s)=1/g}}}
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{{{p/ps+s/ps=1/g}}} Add like terms on left.
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{{{(p+s)/ps=1/g}}} Multiply both sides by (gps).(or cross-multiply)
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{{{g(p+s)=ps}}} Divide each side by (p+s).
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{{{g=(ps)/(p+s)}}}