Resposta:
1) x = 75
2) a) x = 6
b) x = -(5/2)
c) x = 3
d) x = -4
e) x = 30
Explicação passo a passo:
1) 112+7x-262=5x
[tex]7x-5x = 262-112\\2x = 150\\x = 75[/tex]
2) a) 10x-38=22
[tex]10x = 22+38\\10x = 60\\x = 6[/tex]
b) 2x-5=-10
[tex]2x = -10 + 5\\x = \frac{-5}{2} = -\frac{5}{2}[/tex]
c) 5x -27 = -4x
[tex]5x+4x = 27\\9x = 27\\x = 3[/tex]
d) 11x + 17 = 10x + 13
[tex]11x -10x = 13-17\\x = -4[/tex]
e) x/5 = 21 - x/2
[tex]10\times \frac{x}{5} = 10 \times 21 - 10\times\frac{x}{2}\\2x = 210 -5x\\2x+5x = 210\\7x = 210\\x = \frac{210}{7} = 30[/tex]
