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If 10y = 7x - 4 and 12x + 18y = 1; find the values of 4x + 6y and 8y - x.
Solution of equations x + y = 8 and 3x - 5y = 0 is :
x = 5, y = -3
x = 5, y = 3
x = -5, y = 3
x = -5, y = -3