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(5*(x-4))/7 = -2*x // + -2*x
(5*(x-4))/7-(-2*x) = 0
(5*(x-4))/7+2*x = 0
(5*(x-4))/7+(2*7*x)/7 = 0
5*(x-4)+2*7*x = 0
19*x-20 = 0
(19*x-20)/7 = 0
(19*x-20)/7 = 0 // * 7
19*x-20 = 0
19*x-20 = 0 // + 20
19*x = 20 // : 19
x = 20/19
x = 20/19
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