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5*x-(4*z)-(62/20) = 3 // - 3
5*x-(4*z)-(62/20)-3 = 0
5*x-4*z-31/10-3 = 0
5*x-4*z-61/10 = 0 // + -4*z-61/10
5*x = -(-4*z-61/10) // : 5
x = (-(-4*z-61/10))/5
x = (61/10-(-4*z))/5
x = (61/10-(-4*z))/5
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