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x/5y + 2x/3y = 3x/15y + 10x/15y = 13x/15y
4y
x=20 y=-3
I'm assuming you mean 15y+10x=12? ... That'd be y=-5/3x+12/15
6y3 + 8y2 - 15y - 20 is an expression, not an equation (or inequality). An expression cannot be solved.The expression factorises to (3y + 4)*(2y2 - 5)