Question

evaluate 5(x – 1) – 2(x – 1) + 7(x – 1) = 12​

Answer 1

$5x - 5 - 2x + 2 + 7x - 7 = 12 \\ = > 5x - 2x + 7x - 5 + 2 - 7 = 12 \\ = > 5x + 5x - 3 - 7 = 12 \\ = > 10x - 10 = 12 \\ = > 10x = 12 + 10 \\ = > 10x = 22 \\ = > x = \frac{22}{10} \\ \ = > x = \frac{11}{5} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

Answer 2

Step-by-step explanation:

5(x – 1) – 2(x – 1) + 7(x – 1) = 12

expand the brackets

5x-5-2x+2+7x-7=12

collect all the like terms together

10x-10 =12

to find x move the 10 to the other side so it becomes +10

10x= (12+10)

10x= 22

x= 22/10

x=2.2

substitute x=2.2 into 5(x – 1) – 2(x – 1) + 7(x – 1) = 12

5(2.2-1) -2(2.2-1) +7(2.2-1) =12