Question

resolva as equacoes :
A) x + x + x =78
B)2X + 3X + 4 = 189
C)2X + 3X + 4X = 189
D) 5X - 4 - 3X = -16
e)5x+ x - 4 = -4
____________
7
F) 8x - 9 - x = -1
__________
5

Answer 1

A) x+x+x=78
3x= 78
x = 78/3
x = 26
S= {26}

B) 2x + 3x + 4= 189
5x=189 - 4
5x= 185
x= 185/5
x= 37
S= {37}

C) 2x+3x+4x =189
9x= 189
x = 189/9
x = 21
S= {21}

S) 5x - 4 - 3x = -16
5x-3x = -16+4
2x = -12
x= -12/2
x= -6
S= {-6}

E) 5x + x - 4 = -4
5x + x= -4+4
6x= 0
x= 0/6
S= {0/6}

F) 8x - 9 - x = -1
8x-x= -1+9
7x= 8
x= 8/7
S= {8/7}