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78 + yz = yz + 78
y2 + 10z - 10y - yz = y2 - 10y - yz + 10z = y(y - 10) - z(y - 10) = (y - 10)(y - z)
3xy2z
Collect like terms together and simplify: 18xyz²6x³ = (18 × 6)(xx³)yz² =108x⁴yz²
The idea here is to transfer to the other side everything you don't need. x = yz yz = x (switching both sides) y = x/z (you divide both sides by z, since you want to get rid of the z on the left side).