Question

c] 3x-221/5=x+45
d]120x-72=48x-216
qual e as raizes das seguintes equacoes

Answer 1

c. 3x-221/5 = x + 45
Multiplicarei tudo por 5 para tirar a fração:
15x-221 = 5x + 225

Isolarei a incognita:
15x-5x = 225 + 221
10x = 446
x = 446/10
x = 223/5

d. 120x-72 = 48x-216
120x-48x = -216 + 72
72x = -144
x = -144/72
x = -2

Tenha um bom domingo de estudos!

Answer 2

$c)3x- \frac{221}{5} =x+45\to\to mmc=5\\\\ 15x-221=5x+225\to \\\\ 15x-5x=225+221\to \\\\ 10x=446\to \\\\ x= \frac{446}{10} \to \\\\ x= \frac{223}{5}$



$d) 120x-72=48x-216\to \\\\ 120x-48x=-216+72\to \\\\ 72x=-144\to \\\\ x= \frac{-144}{72} \to\\\\ x=-2$