Minus five, plus one, equals minus four.
4' four
1*-7 +7-4=-4
Four minus two and three-eighths equals one and five-eighths.
7
3
No. It is only true for one value of x so it is an equation. An identity must be true for all values of x. An identity equation is like saying "in other words ... ".
Minus five, plus one, equals minus four.
83
4' four
Two negatives make a positive so your equation simplifies firstly as 4ab + 3ab and finally as 7ab.
1*-7 +7-4=-4
Four minus two and three-eighths equals one and five-eighths.
Negative 5.
7
Four minus three equals one. (Or, 4 - 3 = 1.)
Yes, it can. For example, if you are solving a quadratic equation, the curve could cross the x-axis in more than one place, thus the equation would have two solutions, a cubic equatuion can have 3 solutions, an equation with a power of four in it can have four solutions, etcetera.