Question

a) x+3 supra 7 - 21 supra 2= x supra 2-5 b) x+7 supra 9 -11 supra 2=x-3 supra 2 c) 3x-2 supra 5-x-7 supra 2=2x supra 5+34 supra 5 d) x-3(x+3) supra 5 -10 supra 10=x supra 5+41 supra 2

Answer 1

a) 14x + 6 - 147 totul / 14 = x - 10 / 2

(14x + 6 - 147) • 2 = 14(x-10)

(14x - 141) • 2 = 14x - 140

2 • 14x - 282 = 14x - 140

x + 3/7 - 21/2 = x/2 - 5

28x - 282 = 14x - 140

28x = 14x + 142

28x - 282 + 282 = 14x - 140 + 282

14x = 142

x = 71 / 7.

b) nu exista soluție, cel puțin eu n-am gasit

c) 2x - 2/5 - 7/2 = 2x/5 + 34/5

20x - 4 - 25 totul / 10 = 2x + 24 / 5

(20x - 4 - 35) • 5 = 10(2x + 34)

100x - 20x = 20x - 20x + 535

(20x - 39) • 5 = 10 • 2x + 340

80x = 537

x = 107 / 16.

d) -3(x+3) / 5 + x - 1 = 2x + 205 / 10

-6x + 18 - 10x = 2x + 205

- 10 • 3(x+3) / 5 + 10x + 10 • (-1) = 10(2x + 205) / 10

-30(x+3) / 5 + 10x - 10 = 2x + 205

-30x + 90 / 5 + 10x - 10 = 2x + 205

4x = 2x + 233

4x - 28 + 28 = 2x + 205 + 28

4x - 28 = 2x + 205

2x = 233

4x - 2x = 2x - 2x + 233

x = 233 / 2.

/ = supra.