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(1/18)*(5*x-(3*x))-31 = (7/24)*x // - (7/24)*x
(1/18)*(5*x-(3*x))-((7/24)*x)-31 = 0
(1/18)*(5*x-3*x)+(-7/24)*x-31 = 0
1/18*2*x+(-7*x)/24-31 = 0
(1/18*2*24*x)/24+(-7*x)/24+(-31*24)/24 = 0
1/18*2*24*x-7*x-31*24 = 0
-13/3*x-744 = 0
(-13/3*x-744)/24 = 0
(-13/3*x-744)/24 = 0 // * 24
-13/3*x-744 = 0
-13/3*x-744 = 0 // + 744
-13/3*x = 744 // : -13/3
x = 744/(-13/3)
x = -2232/13
x = -2232/13
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