solve the systems of equation

7x+2y=18

-4x-3y=-1

7x+2y=18 times 3/2 is (21/2)x+3y=27

thus (21/2)x-4x+3y-3y=27-1

(13/2)x=26

x=26*2/13=4

thus x=4, y=10/7

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