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1.5 = ((300-210)/3)*x // - ((300-210)/3)*x
1.5-(((300-210)/3)*x) = 0
1.5-30*x = 0 // - 1.5
-30*x = -1.5 // : -30
x = -1.5/(-30)
x = 0.05
x = 0.05
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