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[ 2x - 3y = 7 ] *3 = [ 6x - 9y = 21 ]
[ 3x + 4y = 2 ] *2 = [ 6x + 8y = 4 ]
[ 6x + 8y = 4 ] - [ 6x - 9y = 21 ] = [ 17y = -17 ]
Therefore, y = -1.
Substituting y = -1 into the o...
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