Question

Ajutati-ma va rog cu aceste ecuații :
a) 7×(2x-1)=35
b) 3(2x+5)=63
c) 6×(3x+9)=-72
va rog ​

Answer 1

a)

$7 \times (2x - 1) = 35 \\ 14x - 7 = 35 \\ 14x = 35 + 7 \\ 14x = 42 \\ x = 42 \div 14 \\ x = 3$

b)

$3(2x + 5) = 63 \\ 6x + 15 = 63 \\ 6x = 63 - 15 \\ 6x = 48 \\ x = 48 \div 6 \\ x = 8$

c)

$6 \times (3x + 9) = - 72 \\ 18x + 54 = - 72 \\ 18x = - 72 - 54 \\ 18x = - 126 \\ x = -126 \div 18 \\ x = -7$