Question

urgent va rog faceti ecuatiile astea 1)7x-14=5x-2 2)5(x+1)=2(x-1) 3)2(2x-5)=3(x-2)+7 4)4(x-7=5(x+1)+10x

Answer 1

Răspuns:

Explicație pas cu pas:

1)7x-14=5x-2

7x - 5x = 14 - 2

2x = 12

x = 12/2 = 6

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2)5(x+1)=2(x-1)

5x + 5 = 2x - 2

5x - 2x = -5 - 2

3x = -7

x = -7/3

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3)2(2x-5)=3(x-2)+7

4x - 10 = 3x - 6 + 7

4x - 10 = 3x + 1

4x - 3x = 10 + 1

x = 11

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4)4(x-7)=5(x+1)+10x

4x - 28 = 5x + 5 + 10x

4x - 28 = 15x + 5

15x - 4x = -28 - 5

11x = -33

x = -33/11 = -3