exam Maths Puzzle Numerical Ability

-3(10x - 3) + 10(3x - 3) = x - 7

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exam Other Question

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 Factor: 15+3y-5x^2-x^2y