(x - 7)*(3*x - 2) - (5*x + 1)*(2*x - 4)
(-2.0 + 3.0*x)*(-7.0 + x) - (1.0 + 5.0*x)*(-4.0 + 2.0*x)
(-7 + x)*(-2 + 3*x) - 2*(1 + 5*x)*(-2 + x)
2 18 - 7*x - 5*x
-(-9 + 7*x)*(2 + x)