2(x - 3y + 7z)
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the simplest form of 5x + 3y +2x - 6y is 7x-3y
x - 3y = -3: multiply by -2 giving -2x + 6y = 6, but -2x + 6y = 12 so we have a problem! Misprint?
5x + 6y + 3y - 2x you have to add like terms. add the y terms and then the x terms 9y + 3x this is your answer
x(y - 10) + 6y
it is -4