y - 0,7 - 1,4y -3 = -0,4y -3,7
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Adding and subtracting polynomials is simply the adding and subtracting of their like terms.
Their difference.
your mom is 2
a difference
Yes the bottom has to be the same when subtracting fractions. The bottom (or denominator) tells you what you're working with. You cannot subtract thirds from halves just as you cannot subtract oranges from tissues.