Question

[2x(d-30)-45]x3=165 prin metoda mersului invers

Answer 1

[2x(d-30)-45]x3=165
[2x(d-30)-45] = 165:3 = 55
2x(d-30) = 55 + 45 = 100
d-30 = 100:2 = 50
d=50+30 = 80
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Verificare: (2x50-45)x3 = 55x3 = 165 OK
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Succes in continuare!