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Get Equal Sign With Arrows On Both Sides UK. There are upward arrows ↑, downward arrows ▼, and also round ↺, curved ↝, double ⇅ and triple ⇶. There's even a 3d arrow ➫!
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A set of values that satisfy a given set of equations of inequalities. Basically, seen as there is only one variable involved, all you need to is multiply out of the brackets and then balance the equation. When a notation sign is used it signifies that if lhs is true then rhs is also true.
There are upward arrows ↑, downward arrows ▼, and also round ↺, curved ↝, double ⇅ and triple ⇶.
The => is more of an implication notation to show that logically both sides of the notation are equal. The same rule would apply if you're multiplying both sides by a fraction. Always make sure the small end points to the small value. What does the $\rightarrow$ arrow mean when showing working out in maths?
