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18*x = (1/2)*(10*x-5) // - (1/2)*(10*x-5)
18*x-((1/2)*(10*x-5)) = 0
(-1/2)*(10*x-5)+18*x = 0
18*x-1/2*(10*x-5) = 0
18*x-1/2*(10*x-5) = 0
13*x+5/2 = 0
13*x+5/2 = 0
13*x+5/2 = 0 // - 5/2
13*x = -5/2 // : 13
x = -5/2/13
x = -5/26
x = -5/26
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