30-x+40-30+30-10=30.What is x?, 20, 10, 25, 30, 15, 3, In witch question is x 9?, 30-x=4, 15-x=6, 18-x=15, 9+x=19, 8+x=17, 9+5=x, how many ways are there to find x in addition and subtraction?,  2, 4, 50, 1, 0, 100.

Algebra

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