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4 - 5 = x
-1 = x
B) No sé si el 4 iba con x o ese signo de "+" no va ahí, si me aclaras te lo resuelvo.
C) -3x+15+3 = 4x-24+6
-3x+18= 4x-18
18+18 = 4x+3x
36 = 7x
36 ÷ 7 = x
5.14 = x
D) 8x-32 = -6x-72-2
8x-32 = -6x-74
8x+6x = -74+32
14x = -42
x = -42 ÷ 14
x = -3