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(19/30)*x+4 = (7/10)*x // - (7/10)*x
(19/30)*x-((7/10)*x)+4 = 0
(19/30)*x+(-7/10)*x+4 = 0
4-1/15*x = 0 // - 4
-1/15*x = -4 // : -1/15
x = -4/(-1/15)
x = 60
x = 60
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