Question

exercitiul 6 va roog mult​

Answer 1

$\it a)\ 9\cdot(x-7)=-63|_{:9}\ \Rightarrow x-7=-7\ \Rightarrow\ x=-7+7=0$

$\it c)\ 2(-x+4)=-3(x+1)+23\ \Rightarrow\ -2x+8=-3x-3+23\ \Rightarrow\ \\ \\ \ \Rightarrow\ 3x-2x=23-3-8\ \Rightarrow\ x=12$