Question

a
14. Rezolvaţi în Q ecuațiile:
©) 15(x - 1) + 4(2 – 3x) = 9 - 2(x + 4);
10. (3 – x) + 6(x + 2) =13 + "7. (2x - 1).
b) 2(2x + 7) + 3(x-1) = 6(x + 3)-18

Answer 1

Explicație pas cu pas:

a)15x - 15 + 8 - 12x = 9 - 2x - 8

3x - 7 = 1-2x

3x + 2x = 1+7

5x = 8

x = 8/5

b) 30- 10x + 6x + 12 = 13 + 14x - 7

-4x +42= 14x +6

-4x - 14x = 6-42

-18x = - 36

x = 36/18

x =2

c) 4x+14 +3x - 3 = 6x +18 - 18

7x + 11 = 6x

7x - 6x = 11

x = 11

Answer 2

$\it 15(x-1)+4(2-3x)=9-2(x+4) \Rightarrow 15x-15+8-12x=9-2x-8 \Rightarrow \\ \\ \Rightarrow 3x-7=-2x+1 \Rightarrow 3x+2x=1+7 \Rightarrow 5x=8 \Rightarrow x=\dfrac{8}{5}=1,6$

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$\it 2(2x+7)+3(x-1)=6(x+3)-18 \Rightarrow 4x+14+3x-3=6x+18-18 \Rightarrow \\ \\ \Rightarrow 7x+11=6x \Rightarrow 7x-6x=11 \Rightarrow x=11$