book Maths Puzzle Numerical Ability

x+1/2=-3/4

3/5x=-9

3x-3/5=12/5

5-5x=7x-3(5x-6)

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book Other Question

what other way can u rewrite PV = nRT thrity years ago gasoline cost 30 cents per gallon. Today gasoline averages about $1.65 per gallon. What is the percentage of increase in the cost of gasoline

How do i figure it out?