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(4/5)*x+1/2 = -11/90 // + -11/90
(4/5)*x+1/2-(-11/90) = 0
(4/5)*x+1/2+11/90 = 0
4/5*x+28/45 = 0 // - 28/45
4/5*x = -28/45 // : 4/5
x = -28/45/4/5
x = -7/9
x = -7/9
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