The correct option is B no
Given, 10+10x=5x+5
Step 1: Subtract both sides of the equation by 10 to eliminate 10 on the left side of the equation.
⇒10+10x−10=5x+5−10⇒10x=5x−5
Step 2: Subtract both sides of the equation by 5x to eliminate 5x on the right side of the equation.
⇒10x−5x=5x−5−5x
⇒5x=−5
Step 3: Now, divide both sides by 5 to eliminate 5 on the left side of the equation.
⇒5x5=−55
⇒x=−1 is the solution of the equation 10+10x=5x+5.
Hence given solution x = 1 is not the solution for the above equation.