Question

2(7-a)-5a-2(7-a)-5a-2(7-a)+5a-5a+2(7-a)-5(a-7)+2a-5(a+7)-2a

Answer 1

2(7-a)-5a = 2•7-2•а-5а= 14-2а-5а= 14-7а


-2(7-a)-5a= -2•7 -2•(-а) -5а= -14+2а-5а=
-14-3а= -(14+3а)


-2(7-a)+5a= -2•7-2•(-а)+5а= -14+2а+5а=
-14+7а= 7а-14


-5a+2(7-a)= -5а+2•7+2•(-а)= -5а+14-2а=
14-7а


-5(a-7)+2a= -5•а-5•(-7)+2а= -5а+35+2а=
35-3а


-5(a+7)-2a= -5•а-5•7-2а= -5а-35-2а=
-7а-35= -(7а+35)

Answer 2

Let's simplify the expression step by step:

2(7-a) - 5a - 2(7-a) - 5a - 2(7-a) + 5a - 5a + 2(7-a) - 5(a-7) + 2a - 5(a+7) - 2a

First, let's simplify the terms within parentheses:

2(7-a) = 14 - 2a 2(7-a) = 14 - 2a 2(7-a) = 14 - 2a 2(7-a) = 14 - 2a

Now, let's simplify the rest of the expression:

14 - 2a - 5a - 14 + 2a - 5a + 5a - 2(7-a) + 35 - 5(a+7) - 2a

Combining like terms:

-2a - 5a + 2a - 5a + 5a - 5(7-a) + 35 - 5(a+7)

Simplifying further:

-10a + 5a - 35 + 5a + 35 - 5a - 35 + 5a

Combining like terms again:

-10a + 5a + 5a - 5a

Simplifying:

0a

Therefore, the expression simplifies to:

0a, which is equal to 0.