Im so lost ...

5n + 34 = - 2 (1 - 7n)

The answer for

-3 (4x+3) + 4 (6x+1) = 43

is

First, you can distribute the - 2 to 1 - 7n

the new equation is 5n + 34 = - 2 + 14n

then, you can add 2 to both sides to cancel the - 2 on the right

now you have 5n + 36 = 14n

after this, you add - 5n to both sides, again, to cancel the 5n on the left

you are left with 34 = 9n

lastly, divide both sides by 9 to find the value of n, which is 4.