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10 questions
x+x =
2x
x2
2x+2x=
2x2
4x
x ×x =
2x
x2
4x×x =
4x2
5x
a+4a=
5a
4a2
y×5y =
6y
5y2
4a+a+b =
5a+b
4a2+b
3h×h×y
3hy
3h2y
6c+d+2c+3d =
8c+4d
7c+5d
−7xy+2xy−xy =
8xy
-4xy
-6xy
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