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7x²+5x*5x=7x²+25x²=32x²
5a+6b*2-a=4a+12b
x+y+y+2y=x+4y
6a+x+4x+y-5x-y+15y=6a+16y
x+y+x=2x+y
x²+2x²+x=3x²+x
z+a+z+a-z=2a+z
a*a+z=a²+z
x+a+x=2x+a
x+3x+4z-z+7x-3x=8x-3z
z+z-z+z-z+a=a+z
2x²+5x²+x=7x²+x
x+x+4x+a+5a-x=6a+5x
x-x-x-x-x+5z+x+x-z=-3x+4y