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(1/2)*(18-(5*x)) = 6-(4*x) // - 6-(4*x)
(1/2)*(18-(5*x))+4*x-6 = 0
(1/2)*(18-5*x)+4*x-6 = 0
1/2*(18-5*x)+4*x-6 = 0
1/2*(18-5*x)+4*x-6 = 0
3/2*x-6+9 = 0
3/2*x+3 = 0
3/2*x+3 = 0
3/2*x+3 = 0 // - 3
3/2*x = -3 // : 3/2
x = -3/3/2
x = -2
x = -2
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