When adding or subtracting from both sides, the symbol doesn't change. The symbol only reverses when both sides are multiplied or divided by a negative number, because doing so makes the lesser side greater and the larger side smaller.
Consider:
5>-3 *-1 -5<3
6>4 *-1 -6<-4
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u only reverse the sign when u multiply or divide by a NEGATIVE number...otherwise u don't change the direction
how the hell should i know
In simple terms, it doesn't matter. x<6 is the same as 6>x.
With a formula, you know the variable's value, and you have to calculate the value of the function of it. With an equation, you know the function's value, and you have to calculate the value of the variable.
A variable is a symbol for a number that we don't yet know. It is usually a letter such as x or y.