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7*(x+1/5) = 7.5*x // - 7.5*x
7*(x+1/5)-(7.5*x) = 0
7*(x+1/5)-7.5*x = 0
7*(x+1/5)-7.5*x = 0
7/5-0.5*x = 0
7/5-0.5*x = 0
7/5-0.5*x = 0 // - 7/5
-0.5*x = -7/5 // : -0.5
x = -7/5/(-0.5)
x = 2.8
x = 2.8
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