Question

rezolvati in multime numerele naturale inecuatiei 2×{12+3×[60-3×(27-4×3)]}-5x=7

Answer 1

2·{12+3·[60-3·(27-4·3)]}-5x=7
2·{12+3·[60-3·(27-12)]}-5x=7
2·[12+3·(60-3·15)]-5x=7
2·[12+3·(60-45)]-5x=7
2·(12+3·15)-5x=7
2·(12+45)-5x=7
2·57-5x=7
114-5x=7
5x=114-7
5x=107
x=107:5
x=21,4