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a) 5x+2x=7x
b)-3y²+4y²=y²
c)2ab²-a²b=2ab²-a²b
-4x³.2x=-8x⁴
e)1/2a³.3/4a²=3/8a⁵
f)9a:3a=3
g)-10x³y²:x²=-10xy
h)5x²+7x=5x²+7x
i)4x-5xy=4x-5xy
j)-3x+4y²=-3x+4y²
k)10x³:2xy²=5x²y²