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(5/7)*(14*x-21)+19 = 12*((2/3)*x-2)+15*x // - 12*((2/3)*x-2)+15*x
(5/7)*(14*x-21)-(12*((2/3)*x-2))-(15*x)+19 = 0
(5/7)*(14*x-21)-12*((2/3)*x-2)-15*x+19 = 0
5/7*(14*x-21)-12*(2/3*x-2)-15*x+19 = 0
5/7*(14*x-21)-12*(2/3*x-2)-15*x+19 = 0
2*x-15*x+9+19 = 0
9-13*x+19 = 0
28-13*x = 0
28-13*x = 0
28-13*x = 0 // - 28
-13*x = -28 // : -13
x = -28/(-13)
x = 28/13
x = 28/13
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