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Delimiter between question and answer:

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Solve
40 and 50
Solve
x=0 ; y=0
Solve
7
3a + 4b = 43 -2a + 3b = 11
a = 5, b = 7
Solve by equating coefficients method: x + 2y = -4 3x - 5y = -1
x = -2, y = -1
Solve by substitution method: 11y + 15x = -23 7y - 2x = 20
x = -3, y = 2
Solve by substitution method: x + y = 7 2x - 3y = 9
x = 6, y = 1