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(3*x+14)/4+(x+33)/5 = 12 // - 12
(3*x+14)/4+(x+33)/5-12 = 0
(5*(3*x+14))/(4*5)+(4*(x+33))/(4*5)+(-12*4*5)/(4*5) = 0
5*(3*x+14)+4*(x+33)-12*4*5 = 0
19*x-240+202 = 0
19*x-38 = 0
(19*x-38)/(4*5) = 0
(19*x-38)/(4*5) = 0 // * 4*5
19*x-38 = 0
19*x-38 = 0 // + 38
19*x = 38 // : 19
x = 38/19
x = 2
x = 2
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