Question

19×(39-2x)=703
2(2x +3x)=20
12(x+9x)=1200
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Answer 1

1) 741-38х=703
-38х=703-741
-38х=-38
Х=1
2) 4х+6х=20
10х=20
х=2
3)12х+108х=1200
120х=1200
х=10

Answer 2

19 * (39 - 2х) = 703
39 - 2х = 703 : 19
39 - 2х = 37
2х = 39 - 37
2х = 2
х = 1
--------------------------------
19 * (39 - 2 * 1) = 703
     19 * (39 - 2) = 703
             19 * 37 = 703
                  703 = 703

2 * (2х + 3х) = 20
2 * 5х = 20
5х = 20 : 2
5х = 10
х = 2
--------------------------------
2 * (2 * 2 + 3 * 2) = 20
           2 * (4 + 6) = 20
                 2 * 10 = 20
                      20 = 20

12 * (х + 9х) = 1200
12 * 10х = 1200
10х = 1200 : 12
10х = 100
х = 10
-------------------------------------   
12 * (10 + 9 * 10) = 1200
      12 * (10 + 90) = 1200
               12 * 100 = 1200
                     1200 = 1200