Question

determina termenul necunoscut din egalitatile urmatoare : [2•(d-30)-45]•3=165

Answer 1

[2•(d-30)-45]•3=165
2•(d-30)-45=165:3
2•(d-30)-45=55
2•(d-30)=55+45
2•(d-30)=100
d-30=100:2
d-30=50
d=50+30
d=80

Answer 2

[2•(d-30)-45]•3=165
2x(d-30)-45=165:3
2x(d-30)-45=55
2x(d-30)=55+45
2x(d-30)=100
d-30=100:2
d-30=50
d=50+30
d=80