Question

cum se face 
 7(5x-6)=98
(340+x) ori 25 = 1000  
(X+3 ) : 4 = 25 

(3x-4) :5 = 4 
(2x+5) :7 = 5 
(3x+1) : 5 = 8

Answer 1

7(5x-6)=98
35x-42=98
35x=98+42
35x=140
x=140:35
x=4

(340+x) · 25 = 1000
340+x=1000:25
340+x=40
x=40-340
x=-300


(X+3 ) : 4 = 25
x+3=25·4
x+3=100
x=100-3
x=97


(3x-4) :5 = 4
3x-4=4·5
3x-4=20
3x=20+4
3x=24
x=24:3
x=8

(2x+5) :7 = 5
2x+5=5·7
2x+5=35
2x=35-5
2x=30
x=30:2
x=15

(3x+1) : 5 = 8
3x+1=8·5
3x+1=40
3x=40-1
3x=39
x=39:3
x=13