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Anonymous
x + 2y - 9 = 4 can be rewritten as x + 2y = 13, but this is as far as you can simplify it because you have two unknowns and one equation.
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2x-4
x(x+4) equals x2 plus 4x
If the x=4, then its equivelent to 12 + 4, which equals 16.
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