setença verdadeira de 3x=27 x+9=0 x+5=7 2x=-16 x=-16+12
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3x = 27
x = 27/3
x = 9
****************
x + 9 = 0
x = - 9
***************
x + 5 = 7
x = 7 - 5
x = 2
******************
2x = - 16
x = - 16/2
x = - 8
*******************
x = - 16 + 12
x = - 4
*************************
x = 27/3
x = 9
****************
x + 9 = 0
x = - 9
***************
x + 5 = 7
x = 7 - 5
x = 2
******************
2x = - 16
x = - 16/2
x = - 8
*******************
x = - 16 + 12
x = - 4
*************************
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