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5x/5 - 2x/5 = 1/2
3x/5 = 1/2
6x = 5
x = 5/6
Lo que tienes que hacer es despejar x para hallar su valor.
x - 1/2 = 2/5
(2x + ( - 1))/2 = 2/5
5 (2x - 1) = 2 * 2
10x - 5 = 4
10x = 4 + 5
10x = 9
x = 9/10
Solución :
x = 9/10