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8*x-9 = (1/2)*(13*x-41) // - (1/2)*(13*x-41)
8*x-((1/2)*(13*x-41))-9 = 0
(-1/2)*(13*x-41)+8*x-9 = 0
8*x-1/2*(13*x-41)-9 = 0
8*x-1/2*(13*x-41)-9 = 0
3/2*x-9+41/2 = 0
3/2*x+23/2 = 0
3/2*x+23/2 = 0
3/2*x+23/2 = 0 // - 23/2
3/2*x = -23/2 // : 3/2
x = -23/2/3/2
x = -23/3
x = -23/3
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