(35+х)-15 = 35 + х -15 = 35 - 15 +х = 20+х
(35+х)-15=35+х-15 =20+х
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(35+х)-15 = 35 + х -15 = 35 - 15 +х = 20+х
(35+х)-15=35+х-15 =20+х