the positive sign in t+2 over 7 should be changed into negative in line 2
There is a mistake at Line 2.The +10 on the LHS should be changed to -10. Because when 2 x -7, it will give u, -10.
There is a mistake in line 2 . The positive 10 should be changed into a negative 10 as when we multiply a negative number with a positive number we would get a negative number .
There is a mistake in line 1 to 2, the mistake is in -t+2/7=-7t+10 it should be -t+2/7=-7t-10 as the negative sign affects the whole fraction
The mistake lies in line 2. There should be a braket when you minus another equation. So it should be 7t-(5t-10) / 35.
Line 2: The 5t+10 should be changed to 5t-10. That mistake has caused the remaining parts of the equation to be wrong.
In line 2, it should be -10 not +10.
In line two: It should be (7t-5t-10)/35 As 7t/35-(5t+10)/35 is (7t-5t-10)/35