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4x +3y = 11
x= 31 + 2y/ 5
x = 11-3y / 4
31+ 2y/ 5 = 11-3y/4
4( 31 + 2y) = 5(11-3y)
124+ 8y= 55-15y
8y + 15y = 55-124
23y = -69
y = -69/ 23
y = -3
4x + 3 (-3) =11
4x = 11 + 9
4x = 20
x= 5