Question

rezolva ecuatiile 2[x+1]=18, 12ori [3-x]=0, 3ori [x+125]=253+647, 10ori[x+7]-23=177, [621-x]ori5=495 , 5x-10=3x, 7x+4=3x+8, x+12=7x-6 , x+12=7x-6 , 15-x=4x , 145-x=x-41, 9251+3x=9676-2x

Answer 1

a) 2 (x +1) = 18
2x + 2 = 18
2x = 18-2
2x = 16
x= 16/2
x = 8

b) 12 (3-x) = 0
36 - 12 x = 0
 36 = 12 x
x = 36/ 12
x = 3

c) 3 (x + 125) = 253 + 647
3x + 375 = 900
3x = 900 - 375
3x = 525
x = 525 / 3
x = 175

d) 10 (x + 7) - 23 = 177
10 x + 70 - 23 = 177
10 x +47 = 177
10 x = 177- 47
10 x = 130
x = 130/ 10
x = 13

e) (621 - x) 5 = 495
3105 - 5x = 495
3105 - 495 = 5x
2610 = 5 x
x = 2610 / 5
x = 522

f) 5x - 10 = 3x
5 x - 3x = 10
2x = 10
x = 10/2
x = 5

g) 7x + 4 = 3x + 8
7x - 3x = 8 - 4
4x = 4
x = 4 / 4
x = 1

h) x + 12 = 7x - 6
12 + 6 = 7x - x
18 = 6 x
x = 18/ 6
x = 3

i)15 - x = 4x
15 = x + 4x
15= 5x
x = 15 / 5
x = 3

j) 145 - x = x- 41
145 + 41 = x + x
186 = 2x
x = 186 / 2
x = 93

k) 9251 + 3 x = 9676 - 2 x
3 x + 2 x = 9676 - 9251
5 x = 435
x = 435 / 5
x = 87