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2(x+3) = -1(4x-1)
2x+6 = -4x+1
6x = -5
x =
f(y) = y² +2*(-5/6)y + 4*(-5/6)²
= y² - (5/3)y + 4*(25/36)
= y² - (5/3)y + (25/9)