5х + 40 = 1470
5х = 1470 - 40
5х = 1430
х = 1470/5
х = 286
-------------------
5 · 286 + 40 = 1470
1430 + 40 = 1470
1470 = 1470
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5х + 40 = 1470
5х = 1470 - 40
5х = 1430
х = 1470/5
х = 286
-------------------
5 · 286 + 40 = 1470
1430 + 40 = 1470
1470 = 1470