book Maths Puzzle Numerical Ability

How do i solve this equation?

-3-(-4x)=-4x+24

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book Other Question

If k does not equal 0 and 3*k=6*(2k),what is the value of k? A train leaves Dallas at 1:00pm and travels to Galveston at a rate of 50 mph. A second train from Victoria travels at a rate of 75 mph and a third train leaves Houston at 4:30 pm.