6(2 + 1) = 18
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There is no property that justifies it. The equation is true for some values of x, not for others.
3x+5=17
(27 x 3) - (10 x 3) = 17 x 3 = 51
X - 5 = 17 Add 5 to both sides of the equation: X = 22
You can check an answer by substituting it into the equation. x - 17 = 11 25 - 17 = 11 8 = 11 Since this is not true, 25 is not the answer.