exam Maths Puzzle Numerical Ability

need help solving this equation

-12-7=y/3

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Find the equation of the line that passes through the point (7,-2) and is parallel to the line that passes through (-2,-2) and (3,3) Ron can paint a room in 6 hours working alone. If his son, Jason, helps him, the job takes 4 hours. How long would it take Jason to do the job alone?