Question

Calcule:
1- 9x+10= 3610
2- 8x+15= 673
3- 11x+3= 1020
4- 70+17x= 1414+x
5- x+7x= 840
6- 644+13x= 321
7- x+2x= 369
8- 9x+10= 1810
9- 8x+5= 656
10- 11x+30= 800
11- x+7x= 720
12- 70+17x= 1398+x
13- 6-3x= 5x+14
14- 104+13x= 32+x

Answer 1

Olá! :) 

1) 9x = 3610 - 10
    9x = 3600
      x = 3600÷9 = 400

2) 8x = 673 - 15
    8x = 658
      x = 658÷8 = 82,2

3) 11x = 1012 -3 
    11x = 1009
        x = 1009÷11 = 91,7