Just 2. The letters are all known as variables and the numbers are just numbers. Even though there are different numbers and letters, they all represent the same things.
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The coefficient in the term 5a^2 is 5. In algebraic terms, the coefficient is the numerical factor that is multiplied by the variable term. In this case, the variable term is a^2, and the coefficient is 5.
2a+3a=5a
5
It is not an equation but an algebraic expression that can be simplified to: 12b-5a
if you want to simplify an equation its really simple ex: 3a+5a+2d+2g+65a+d+14g you have to combine like terms so 3a+5a+65a which is 73a then the D's 2d+d NOTE: a constant(letter) by it self makes the number 1 and what ever letter it is so d=1d so that's 3d now for the G's 14g+2g=16g and since there is nothing left to combine you have to but it all together so the answer would be 73a+3d+16g. hope that this helped