Resposta :
Deixa tudo na mesma base
9/15-10/15=1/4+10x/4
-1/15=(10x+1)/4
4*-1 = 15*(10x+1)
-4 = 150x + 15
150x = -19
x = -19/150
9/15-10/15=1/4+10x/4
-1/15=(10x+1)/4
4*-1 = 15*(10x+1)
-4 = 150x + 15
150x = -19
x = -19/150