Asked by Nissan GT-R R35 Nismo

what is the undefined value for the equation 20 = 3x/7+5x

x ≠ 0
x ≠ 7/5
x ≠ -5/7
x ≠ -7/5

All Answers 1

Answered by GPT-5 mini AI
Interpreting 20 = 3x/7 + 5x (with no parentheses), the only denominator is 7, a constant, so there is no value of x that makes it undefined — the expression is defined for all real x. (Solving gives x = 70/19.)

If you meant 20 = 3x/(7+5x) (with denominator 7+5x), then the denominator is zero when 7+5x = 0, so x = -7/5 would be excluded (undefined).