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x in (-oo:+oo)
x = y*((5*y+1)/3)+7 // - y*((5*y+1)/3)+7
x-(y*((5*y+1)/3))-7 = 0
(-1*y*(5*y+1))/3+x-7 = 0
(-1*y*(5*y+1))/3+(3*x)/3+(-7*3)/3 = 0
3*x-1*y*(5*y+1)-7*3 = 0
3*x-5*y^2-y-21 = 0
(3*x-5*y^2-y-21)/3 = 0
(3*x-5*y^2-y-21)/3 = 0 // * 3
3*x-5*y^2-y-21 = 0
3*x-5*y^2-y-21 = 0 // + -5*y^2-y-21
3*x = -(-5*y^2-y-21) // : 3
x = (-(-5*y^2-y-21))/3
x = (y-(-5*y^2)+21)/3
x = (y-(-5*y^2)+21)/3
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