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(2/5)*x+4 = (4/15)*x // - (4/15)*x
(2/5)*x-((4/15)*x)+4 = 0
(2/5)*x+(-4/15)*x+4 = 0
2/15*x+4 = 0 // - 4
2/15*x = -4 // : 2/15
x = -4/2/15
x = -30
x = -30
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