exam Maths Puzzle Numerical Ability

how do you solve -2x=2y+5

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In electronics, circuit gain is modeled by
G = Bt/R + r (lower case) t
where R is the value of a resistor, tis temperature, R (lower case)t is the value of R at temperature t, a
At 10:00 A.M. a car leaves a house at a rate of 60mi/h. At the same time another car leaves the same house at a rate of 50mi/h in the opposite direction. At what time will the cars be 330 miles apart?