exam Maths Puzzle Numerical Ability

Please show me the graph and the answer to this equation I get confuse with the setting up here is my situation 10y+15x=20 my answer was 4 please show me thank you

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exam Other Question
Solve the equation with a repeated factor:

m^3 + 2m^2 - 3m = 0 -3(10x - 3) + 10(3x - 3) = x - 7