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260 = 2*x+((2^2)/3)*x // - 2*x+((2^2)/3)*x
260-(2*x)-(((2^2)/3)*x) = 0
260-2*x-(((2^2)/3)*x) = 0
260-10/3*x = 0 // - 260
-10/3*x = -260 // : -10/3
x = -260/(-10/3)
x = 78
x = 78
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