Question

ajutor cu ecuatiile astea ca inebunesc

a) 6x+3+2(x-4)=7(x+2)
b) 2(2x+1)-3(3x-5)=4x-19
c) 4(3x-5)+3(4x-7)=10x-13
d) 5(2x-1)-3x+6(x+2)=15-9x

Answer 1

Răspuns:

$a)6x + 3 + 2(x - 4) = 7(x + 2) \\ 6x + 3 + 2x - 8 = 7x + 14 \\ 6x + 2x - 7x = 14 + 8 - 3 \\ 8x - 7x = 9 \\ x = 9$

$b)2(2x + 1) - 3(3x - 5) = 4x - 19 \\ 4x + 2 - 9x + 15 = 4x - 19 \\ 4x - 9x - 4x = - 19 - 2 - 15 \\ - 9x = - 36 \\ x = 4$

$c)4(3x - 5) + 3(4x - 7) = 10x - 13 \\ 12x - 20 + 12x - 21 = 10x - 13 \\ 12x + 12x - 10x = 21 + 20 - 13 \\ 14x = 28 \\ x = 2$

$d)5(2x - 1) - 3x + 6(x + 2) = 15 - 9x \\ 10x - 5 - 3x + 6x + 12 = 15 - 9x \\ 10x - 3x + 6x + 9x = 15 + 5 - 12 \\ 22x = 8 \\ x = \frac{8}{22} = \frac{4}{11}$