exam Maths Puzzle Numerical Ability

simplify:

(ax-4x) + (18ax -5x)

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exam Other Question

Determine whether the equation is an identity, a conditional equation, or an inconsistant equation.

1/(x+5) + 2/(x+3) = -2/(x^2 + 8x +15) 1/2x + 2/5 (x-2) = 1