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(1/3)*x+1/5 = 187/135-x // - 187/135-x
(1/3)*x+x+1/5-(187/135) = 0
(1/3)*x+x+1/5-187/135 = 0
4/3*x-32/27 = 0 // + 32/27
4/3*x = 32/27 // : 4/3
x = 32/27/4/3
x = 8/9
x = 8/9
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