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Simple simplifying

100

5x+2x²⁺6x²

8x²⁺5x

200

3x-4x+10x²⁺7x²

-x+17x²

300

2x²-7x-8x²+9x+3x²

2x-3x²

400

4x-3x²+14x²-6x-5²

-2x+7x²

500

17x+8x²+5x-18x²+15x²-26x

-4x+5x²

Algebra + O.O.O

100

What operation is done first in maths

Brackets

200

What operation is done last in maths.

addition or subtraction (depending on what comes first in the equation).

300

x+y=27

y+z=14

z+x=23

x+y+z=

34

400

7/(5x2-(6/3))

0.875

500

4x8-2x11+27/3/3

13