Respostas

2014-07-17T20:04:09-03:00
A)x-16=-32

x - 16 = - 32
x = - 32 + 16
x = - 16

B)A-15=36-2A

A - 15 = 36 - 2A
A + 2A - 15 = 36
A + 2A = 36 + 15
3A = 51
A = 51/3


C)5A²+6A²+7A²-x=-25+5A²+6A²+7A²

5A² + 6A² + 7A² - x = -25 + 5A² + 6A² + 7A²
            
              + 18A² - x = -25  +18A²
    18A² - x - 18A² = - 25
    18A² - 18A² - x = - 25
               0    - x = - 25

-x = - 25
x = (-)(-)25
x =   + 25
x = 25