Question

Resolva:
a) X+21=6
b) 12=X=35
c) -5=X-8
d) X-10=-13
e) 6X=84
f) X=77
7
g) -3X=27
h) 2X=4
5

Answer 1

x + 21 = 6
x = 6 - 21
x = - 15
============================================
12 + x = 35
x = 35 - 12
x = 23
=============================================
- 5 = x - 8 
- x = - 8 + 5
- x = - 3  .(-1)
x = 3 
============================================
x - 10 = - 13
x = - 13 + 10
x = - 3 
===========================================
6x = 84
x = 84/6
x = 14
==================================
  x
----- = 77
  7
x = 77.7
x = 539
=======================================
- 3x = 27  .(-1)
3x = - 27
x = - 27/3
x = - 9
=============================================
  2x
------ = 4
   5
2x = 5.4
2x = 20
x = 20/2
x = 10