-1/4X+(-2/5-X)=-9/20
--1/4x + ( - 2/5 - x) = - 9/20
-1/4x - 2/5 - x = - 9 /20
-1 1/4x = -9/20 + 2/5
-5/4x = -9/20 + 8/20
-5/4x = -1/20
x = -1/20 : (-5/4)
x = 1/20 * 4/5
x = 1/25
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--1/4x + ( - 2/5 - x) = - 9/20
-1/4x - 2/5 - x = - 9 /20
-1 1/4x = -9/20 + 2/5
-5/4x = -9/20 + 8/20
-5/4x = -1/20
x = -1/20 : (-5/4)
x = 1/20 * 4/5
x = 1/25