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x=5y/2
3x+4y=-46
3(5y/2) + 4y = -46
23y/2 = -46
23y = -92
y = -4
2x = 5y
2x = 5(-4)
2x = -20
x = -10
4x-3y=4(-10)-3(-4)= -40+12= -28