If 3x-5= 15-x, then 3x=
A)-15
B)5
C)15
D)25

Question

Quizplus · Accepted Answer

This is a simple algebraic equation with one variable x. Try to bring all terms with x on one side and all other terms on the other side of the equation.
3x -5 = 15 - x
3x + x = 15 +5
4x= 20 or x = 5
But the question asks for value of 3x which is 15 and not 5.
Key takeaway: To solve simple equations, use mathematical operations such as add, multiply to isolate the variable . Get the variable alone on one side of the equal sign

If 3x-5= 15-X, Then 3x=