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(3*(7*x+8))/10 = 4*x-9 // - 4*x-9
(3*(7*x+8))/10-(4*x)+9 = 0
(3*(7*x+8))/10-4*x+9 = 0
(3*(7*x+8))/10+(-4*10*x)/10+(9*10)/10 = 0
3*(7*x+8)-4*10*x+9*10 = 0
24-19*x+90 = 0
114-19*x = 0
(114-19*x)/10 = 0
(114-19*x)/10 = 0 // * 10
114-19*x = 0
114-19*x = 0 // - 114
-19*x = -114 // : -19
x = -114/(-19)
x = 6
x = 6
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