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7-7x=-3x-4
-7x+3x=-4-7
-4x=-11
x=11/4
b) -2-3x=5-4x-9
4x-3x=5-9+2
x=-2
saludos! Jeizon1L
9-2+4 = 7x - 3x
7+4 = 4x
11 = 4x
11/4 = x
-2-3x=5-4x-9
4x - 3x = 5 +2 - 9
x = 7 - 9
x = -2