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- x - 5 + 4x = x + 10 + 3x
-x+4x-x-3x=5+10
-x= 15
x=-15
2)
n + 5 < 9
n <9-5
n <4
R// -infinito,4
3x=10+5+4x
3x-4x=15
-x=15
X=-15
n+5<9
n<4
C.S:]infinito-;4[