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x in (-oo:+oo)
((2*9)/9)*x-(4*9) = (2*9)/3 // - (2*9)/3
((2*9)/9)*x-(4*9)-((2*9)/3) = 0
((2*9)/9)*x-36-6 = 0
2*x-42 = 0 // + 42
2*x = 42 // : 2
x = 42/2
x = 21
x = 21
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