7 equals 7, in any form of math. If it were to have something attached to it, however, such as 7x, it would most likely be something else.
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YES!! You use algebra in your everyday lives. Adding is considered an equation. An equation is a problem with an equal sign. An expression has no answer (an equal sign).
It is: 1/2y
1. With boolean algebra, 1 + n is always equal to 1, no matter what the value of n is.
4x plus 7
If this is algebra then; 3x plus 12x = 15x