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b) -3 + (3) = 0
c) -3 +5 = 2
d) -4+9 = 5
e) -3 +2 = -1
f) -3 +0 = -3
encontrar la x
g) 3x =14 - 2
x=12/3
x=4
h) 4x= 20 -4
x=16/4
x=4
i) 5x=35-5
x= 30/5
x=6
j) 7x=30-2
x=28/7
x=3
k)20x=30+10
x=40/20
x=2
l)15x=50+10
x=60/15
x=4