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(9/4)*x = -81/16 // + -81/16
(9/4)*x-(-81/16) = 0
(9/4)*x+81/16 = 0
9/4*x+81/16 = 0 // - 81/16
9/4*x = -81/16 // : 9/4
x = -81/16/9/4
x = -9/4
x = -9/4
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