book Maths Puzzle Numerical Ability

what do i do to disstrebuet a neg like 7x-2(x-4y)

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book Other Question

how do you put this y=2x+4 on a coordinate grid Three times the first of two numbers decreased by the second number equals 9. Twice the first number increased by the second number equals 11. Find the two numbers. I need a system of equations to solve the problem.