Question

Rezolva ecuatiile:

29-2x=7
11x+5=49
3(x+7)=30
69-(x+19)=48
6+30):2=19
2x-9=9

Answer 1

29 - 2x = 7
2x = 7 +29
2x = 36
x = 36 : 2
x = 18

11x + 5 = 49
11x= 49 - 5
11x = 44
x = 44 : 11
x = 4

3( x + 7) = 30
3x + 21 = 30
3x = 30 - 21
3x = 9
x = 9 : 3
x = 3

69 - ( x + 19 ) = 48
69 - 48 = x + 19
21 = x + 19
21 - 19 = x
2 = x → x = 2

( 6 + 30 ) : 2 = 19
36 : 2 = 19
18 = 19

2x - 9 = 9
2x = 9 + 9
2x = 18
x = 18 : 2
x = 9