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2*x-(4/5) = 10*c // - 10*c
2*x-(10*c)-(4/5) = 0
2*x-10*c-4/5 = 0
2*x-10*c-4/5 = 0 // + -10*c-4/5
2*x = -(-10*c-4/5) // : 2
x = (-(-10*c-4/5))/2
x = (4/5-(-10*c))/2
x = (4/5-(-10*c))/2
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