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(4/5)*x = -2*x-15 // + -2*x-15
(4/5)*x-(-2*x)+15 = 0
(4/5)*x+2*x+15 = 0
14/5*x+15 = 0 // - 15
14/5*x = -15 // : 14/5
x = -15/14/5
x = -75/14
x = -75/14
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