Exercitiul 3)
a)
[tex]\bf x + 3 = 0\\\\\boxed{\bf x = -3}[/tex]
b)
[tex]\bf -x + 9 = 2\\\\x = 9 - 2\\\\\boxed{\bf x = 7}[/tex]
c)
[tex]\bf 3x + 3 = -3\\\\3x = -3 - 3\\\\3x= -6\\\\x = -6 : 3\\\\\boxed{\bf x= -2}[/tex]
d)
[tex]\bf -4x - 4 = 12\\\\4x = -4 - 12\\\\4x = -16\\\\x = -16 : 4\\\\\boxed{\bf x = -4}[/tex]
e)
[tex]\bf 3x = -15\:\:|:3\\\\\boxed{\bf x = -5}[/tex]
f)
[tex]\bf -6x = 36\:\:|:(-6)\\\\\boxed{\bf x= -6}[/tex]
g)
[tex]\bf x : (-2) = 5\:\:|\cdot (-2)\\\\\boxed{\bf x = -10}[/tex]
h)
[tex]\bf x : 9 = -11\:\:|\cdot 9\\\\\boxed{\bf x = -99}[/tex]
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Exercitiul 4)
a)
[tex]\bf x : 3 = -12\:\:|\cdot 3\\\\\boxed{\bf x=-36}[/tex]
b)
[tex]\bf x : (-4) = -10\:\:|\cdot (-4)\\\\\boxed{\bf x = 40}[/tex]
c)
[tex]\bf x : 7 = -8\:\:|\cdot 7\\\\\boxed{\bf x= -56}[/tex]
d)
[tex]\bf x : (-7) = -9\:\:|\cdot (-7)\\\\\boxed{\bf x = 63}[/tex]
e)
[tex]\bf x : (+6) = -12\:\:|\cdot 6\\\\\boxed{\bf x = -72}[/tex]
f)
[tex]\bf x : 8 = -5\:\:|\cdot 8\\\\\boxed{\bf x=-40}[/tex]
g)
[tex]\bf x : (-12) = 11\:\:\:|\cdot (-12)\\\\\boxed{\bf x = -132}[/tex]
h)
[tex]\bf x : (-25) = -25\:\:\:|\cdot (-25)\\\\\boxed{\bf x = 625}[/tex]
