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(7/3)*x+(1/3)*x = 3*x+(5/3)*x+18/3 // - 3*x+(5/3)*x+18/3
(7/3)*x+(1/3)*x-(3*x)-((5/3)*x)-(18/3) = 0
(7/3)*x+(1/3)*x-3*x+(-5/3)*x-6 = 0
-2*x-6 = 0 // + 6
-2*x = 6 // : -2
x = 6/(-2)
x = -3
x = -3
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