5,8y-15,1y=38,29 -1,09
-9,3y=37,2
y=-4
2,51 2,52 2, 53 2 54 2.55 2.56 2.57 2.58 2.59
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-a^3+b^3 = (b-a)(b²+ba+a²)
a^6+1 = (a²+1)(a⁴-a²+1)
x^3y^3-1 = (xy-1)(x²y² + xy + 1)
m^3n^3+8 = (mn + 2)(m²n² - 2mn + 4)