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First collect like terms in the second equation: 5x - 18 = 4y - 3y ie y = 5x - 18

Substitute this for the term in y in the first equation, getting 3x + 2(5x - 18) = 16

ie 3x + 10x - 36 = 16

ie 13x = 16 + 36

so x = 4 and y = 5 x 4 - 18 ie 2.

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