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3360=2? 1680=4? 840=8? 420= 16? 2 10

= 16? 5? Forty two.

= 16? 15? 14

Form:

Connect equal formulas (or numbers expressed in letters) with "=".

Equations are divided into equations with unknowns and equations without unknowns.

For example:

X+ 1 = 3- an equation with unknowns;

2+ 1 = 3- An equation without unknowns.

It should be noted that some equations with unknowns have no solutions, but they are still equations, such as x+ 1 = x-x without solutions.