Question

Resolva as equações: A)10-2×=3×
B)×-3=6+4×
C)(7×-8).2=6.(3×-4)
D)16×-6-7×15+2×

Answer 1

a) 10 - 2x = 3x
-2x - 3x = -10
-5x = -10
-5x = -10    *(-1)
5x = 10
x = $\frac{10}{5}$
x = 2

b) x - 3 = 6 + 4x
x - 4x = 6 + 3
-3x = 9
-3x = 9    *(-1)
3x = -9
x = $\frac{-9}{3}$
x = -3

c) (7x - 8)  * 2 = 6 * (3x - 4)
14x - 16 = 18x - 24
14x - 18x = -24 + 16
-4x = -8
-4x = -8    *(-1)
4x = 8
x = $\frac{8}{4}$
x = 2

d) 16x - 6 - 7x = 15 + 2x
16x - 7x - 2x = 15 + 6
7x = 21
x = $\frac{21}{7}$
x = 3

Espero ter lhe ajudado =)

Answer 2

A)
10 - 2x = 3x
10 = 3x + 2x
10 = 5x
5x = 10
x = 10/5
x = 2

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B)
x - 3 = 6 + 4x
- 3 - 6 = 4x - x
- 9 = 3x
3x = - 9
x = - 9/3
x = - 3

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C)
(7x - 8).2 = 6.(3x - 4)
2.(7x - 8) = 18x - 25
14x - 16 = 18x - 25
- 16 + 25 = 18x - 14x
9 = 4x
4x = 9
x = 9/4

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D)
16x - 6 - 7x = 15 + 2x
9x - 6 = 15 + 2x
9x - 2x = 15 + 6
7x = 21
x = 21/7
x = 3