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207 - ( x + 2 ) × 7 + 33 = 100

Răspuns :

207-(x+2)x 7+33=100
207-(x+2)x 7=100-33
207-(x+2)x 7=67
(x+2)x 7=207-67
(x+2)x 7=140
x+2=140:7
x+2=20
x=20-2
x=18