Question

encontre o valor do X

a)5x+7=28

b)8x-100=-10+200+6x

c)3x+80=180​

Answer 1

Resposta:

a)x = 21/5

b)x = 95

c)x = 100/3

Explicação:

a)5x+7 = 28

5x = 28-7

5x = 21

x = 21/5

b)8x-100 = -10+200+6x

8x-6x = -10+200+100

8x-6x = 190+100

2x = 290

x = 190÷2

x = 95

c)3x+80 = 180

3x = 180-80

3x = 100

x = 100/3

Answer 2

$\large\boxed{\begin{array}{l}\sf a)~\rm 5x+7=28\\\rm 5x=28-7\\\rm 5x=21\\\rm x=\dfrac{21}{5}\\\\\sf b)~\rm 8x-100=-10+200+6x\\\rm 8x-6x=-10+200+100\\\rm 2x=290\\\rm x=\dfrac{290}{2}\\\\\rm x=95\\\sf c)~\rm 3x+80=180\\\rm 3x=180-80\\\rm 3x=100\\\rm x=\dfrac{100}{3}\end{array}}$