Răspuns :
( x + 1 ) * 2 - 3 = ( x - 2 ) * 2
x * 2 + 2 • x • 1 + 1 * 2 - 3 = x * 2 - 2 • x • 2 + 2 * 2
x * 2 + 2x - 2 = x * 2 - 4x + 2
( x + 1 ) * 2 - 3 = ( x - 2 ) * 2
x * 2 + 2 • x • 1 + 1 * 2 - 3 = x * 2 - 2 • x • 2 + 2 * 2
x * 2 + 2x - 2 = x * 2 - 4x + 2