Question

R rezolvați in R ecuațiile
a) 3x+5=0
b) 3(x+2) +4(x+5)=7​

Answer 1

$\bf \: a)3x + 5 = 0 \\ \bf \: 3x = - 5 \: \bf \: x = - \frac{5}{3}$

$\bf \: b)3(x + 2) + 4(x + 5) = 7 \\\bf \: 3x + 6 + 4x + 20 = 7 \\ \bf \: 7x + 26 = 7 \\ \bf \: 7x = 7 - 26 \\ \bf \: 7x = - 19 \\ \bf \: x = - \frac{19}{7}$