Question

1 - Resolva as equações:
7x+10= 2x +30
9x-16= 5x +32
8x + 12= 5x -18
5x-12= x+16
4x+15 = x -12

2- Resolva as equações:
4x +10 +3x= 2x +30
5x -12 +2x = 4x -27
4x +12 +2x = +18
7x -14 -3x= 2x-20

Answer 1

Explicação passo-a-passo:

$7x+10= 2x +30 \\ 7x - 2x = 30 - 10 \\ 5x = 20 \\ x = \frac{20}{5} \\ x = 4$

$9x-16= 5x +32 \\ 9x - 5x = 32 + 16 \\ 4x = 48 \\ x =\frac{48}{4} \\ x = 12$

$8x + 12= 5x -18 \\ 8x - 5x = - 18 + 12 \\ 3x = - 6 \\ x = \frac{ - 6}{3} \\ x = (- 2)$

5x-12= x+16

5x-x=16+12

4x=28

x=28/4

x=7

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4x+15 = x -12

4x-x = -12-15

3x= -27

x= -27/3

x= -9

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4x +10 +3x= 2x +30

4x+3x-2x = 30-10

5x = 20

x = 20/5

x = 4

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5x -12 +2x = 4x -27

5x-4x+2x = 12-27

3x = -15

x = -15/3

x = -5

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4x +12 +2x = +18

4x+2x = 18 -12

6x = 6

x = 6/6

x = 1

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7x -14 -3x= 2x-20

7x-3x-2x = 20-14

2x = 6

x = 6/2

x =3