What value of $x$ satisfies $5x - 7 = 3x + 9$ ?

1Correct answerYour answer2Correct answerYour answer8Correct answerYour answer16Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

Collect the $x$ terms on the left and the numbers on the right: $5x - 3x = 9 + 7$ .
So $2x = 16$ , which gives $x = 8$ .
Check: $5(8) - 7 = 33$ and $3(8) + 9 = 33$ .

Worth noting

16 comes from stopping at $2x = 16$ ; 2 comes from adding $3x$ instead of subtracting it; 1 comes from writing $9 - 7$ instead of $9 + 7$ .

Ten questions from Linear and Quadratic Equations, at your own pace.

Ten questions from Linear and Quadratic Equations, at your own pace.

What value of xxx satisfies 5x−7=3x+95x - 7 = 3x + 95x−7=3x+9?