[tex]\huge\colorbox{pink}{---}\huge\colorbox{yellow}{---}\huge\colorbox{blue}{---}\huge\colorbox{green}{---}\huge\colorbox{cyan}{---}\huge\colorbox{red}{---}\huge\colorbox{purple}{---}[/tex]
Group like terms and simplify
- 6x + 5 + 12x -6 = (- 6x + 12x) + (5 - 6)
= 6x - 1
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Expand brackets
2(x - 9) + 6(-x + 2) + 4x = 2x - 18 - 6x + 12 + 4x
Group like terms and simplify
= (2x - 6x + 4x) + (- 18 + 12) = - 6
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Group like terms and simplify.
3x2 + 12 + 9x - 20 + 6x2 - x
= (3x2 + 6x2) + (9x - x) + (12 - 20)
= 9x2 + 8x - 8
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