a) 7x - 5 = 3x + 4
7x - 3x = 4 + 5
4x = 9
x = \(\dfrac{9}{4}\) = 2,25
b) |3x| = 2x + 3
x = \(-\dfrac{3}{5}\) = -0,6
x = 3
c) \(\dfrac{x+3}{-8}\) \(\ge\) 2
x + 3 \(\le\) - 16
x \(\le\) -16 - 3
x \(\le\) -19
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