Respuesta:
a)2X=28
X=14
b) 800-2X=670
800-670=2X
130=2X
X=65
c)3X + (-7) = (-19)
3X -7 = (-19)
3X= -19 + 7
3X=(-12)
X=(-4)
d) 3X -12 = X-4
3X-X= (-4) +12
2X=8
X=4
e) 2X-8=12
2X = 12+8
2X=20
X=10
f) 2X=X-8
2X-X = (-8)
X= -8
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Respuesta:
a)2X=28
X=14
b) 800-2X=670
800-670=2X
130=2X
X=65
c)3X + (-7) = (-19)
3X -7 = (-19)
3X= -19 + 7
3X=(-12)
X=(-4)
d) 3X -12 = X-4
3X-X= (-4) +12
2X=8
X=4
e) 2X-8=12
2X = 12+8
2X=20
X=10
f) 2X=X-8
2X-X = (-8)
X= -8