2х + 7х = 180
9х = 180
х = 20,
20 - 1 часть
20 * 2= 40
20 * 7= 140
140 - 40 = 100
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2х + 7х = 180
9х = 180
х = 20,
20 - 1 часть
20 * 2= 40
20 * 7= 140
140 - 40 = 100