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6-((21*x)/9) = 4*x-(4/4) // - 4*x-(4/4)
4/4-((21*x)/9)-(4*x)+6 = 0
(-7/3)*x-4*x+4/4+6 = 0
7-19/3*x = 0 // - 7
-19/3*x = -7 // : -19/3
x = -7/(-19/3)
x = 21/19
x = 21/19
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