Question

somando os ângulos 7×/2 + 5 + 5× -30 + 4× - 10=90

Answer 1

resolvendo:

$\frac{25x}{2} -35=90$

$\frac{25x}{2} - 35 = \frac{25x}{2} - \frac{70}{2}$

$\frac{25x}{2} - \frac{70}{2} = 90$

$\frac{25x-70}{2} = 90$

$\frac{2(25x-70)}{2} = 2*(90)$

25x-70 = 2*90

25x-70 = 180

25x + (70 - 70) = 180 +70

25x = 180 + 70

25x = 250

Dividindo os dois lados por 25, temos:

$\frac{25x}{25} = \frac{250}{25}$

x= $\frac{250}{25} = x=10.$