Question

resolvas as equações
a)5x + 3x =16
b)x +x +8 +54
c)7x - 2 - 5x = 18
d)12x - 10x -4 =3
e) - x - 2x -4=11
f)8x= 5x + 4,5

Answer 1

$a) \\ \\ 5x + 3x = 16 \\ \\ 8x = 16 \\ \\ \\ x = \dfrac{16}{8} \\ \\ \\ x = 2$

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$b) \\ \\ x + x - 8 + 54 \\ \\ 2x + 62 = 0 \\ \\ 2x = -62 \\ \\ x = \dfrac{-62}{2} \\ \\ x =-31$

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$c) \\ \\ 7x - 2 - 5x = 18 \\ \\ 2x - 2 = 18 \\ \\ 2x = 18 + 2 \\ \\ 2x = 20 \\ \\ x = \dfrac{20}{2} \\ \\ x = 10$

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$d) \\ \\ 12x - 10x - 4 = 3 \\ \\ 2x = 3 + 4 \\ \\ 2x = 7 \\ \\ x = \dfrac{7}{2} \\ \\ x = 3,5$

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$e) \\ \\ - x - 2x - 4 = 11 \\ \\ -3x = 11 + 4 *(-1) \\ \\ 3x = -11 - 4 \\ \\ 3x = -15 \\ \\ x = \dfrac{-15}{3} \\ \\ x = -5$

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$f) \\ \\ 8x = 5x + 4,5 \\ \\ 8x - 5x = 4,5 \\ \\ 3x = 4,5 \\ \\ x = \dfrac{4,5}{3} \\ \\ x = 1,5$