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(5/7)*x+2/5 = -2*x-(841/35) // + -2*x-(841/35)
(5/7)*x-(-2*x)+2/5+841/35 = 0
(5/7)*x+2*x+2/5+841/35 = 0
19/7*x+171/7 = 0 // - 171/7
19/7*x = -171/7 // : 19/7
x = -171/7/19/7
x = -9
x = -9
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