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(10*z)/3+9/4 = -z/5 // + -z/5
(10*z)/3-(-z/5)+9/4 = 0
(10*z)/3+(1/5)*z+9/4 = 0
53/15*z+9/4 = 0 // - 9/4
53/15*z = -9/4 // : 53/15
z = -9/4/53/15
z = -135/212
z = -135/212
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