0
Anonymous
3*x^2 + 2*x (where x=10)
substitute 10 everywhere you see x. 3*(10^2) + 2*10 = 3*100 + 2*10 = 320
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(2, -1)
x=10
-2
3+3x+7x=13 3x+7x=10 10x=10 x=1
x = 2