Common sense dictates that it could simply be a cramp, or air that is trapped and causes pain. If your ribs are somehow bruised or you suffered from some kind of minor injury, that could very well be a cause. If the problems persists and/or gets worse, see a doctor as soon as possible. It likely is NOT something very serious, but please monitor it and take the appropriate necessary action.
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In an equation, A will be on one side (generally the left side) all alone, and B will have the coefficients and operands. For example: A = 3B + 7
Width does mean side to side.
A number sentence has a left side (Nominative) the equals (verb) and the right side (predicate). It can be an open sentence with a variable, a false statement or a true statement.
It is a half left side triangle, nothing more, nothing less.
Horizontal is from side to side... Right to left or left to right. Remember is by thinking of the horizon at the beach. It is where the sky meets the water. It always appears side to side.