exam Maths Puzzle Numerical Ability

3(x+2)-5=2x+7

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exam Other Question

two planes leave simultaneously from an airport, one flying east and the other west. they are 870 mi apart after 3/4 h. if the eastbound plane averages 120 mi/h more than the westbound plane, at what rate is each plane flying? Find the slope of any line perpendicular to the line through points (9, 12) and (10, 4).
I got -8 but I am not sure if it is right.