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(5/(-9))*x-((2/7)*x)-3 = 0
(5/(-9))*x+(-2/7)*x-3 = 0
-53/63*x-3 = 0 // + 3
-53/63*x = 3 // : -53/63
x = 3/(-53/63)
x = -189/53
x = -189/53
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