Решите уравнение:<span>1)    (0,2x + 0,4х) •3,5 = 6,3;                3) • (х—0,2х):0,4 = 1,6;<br />2)    (0,7х — 0,2x) • 6,4 = 9,6;             4) (0,4x +x): 0,7 = 1,6.</span>
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