Question

(700 × a + 200 ) - 600 = 1000

Answer 1

(700*а+200)-600=1000
700*а+200=1000+600
700*а+200=1600
700*а=1600-200
700*а=1400
а=1400:700
а=2
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(700*2+200)-600=1000
1000=1000

Answer 2

решение во вложении !!!!!!!