-18×[(-7)+3] = (-18)×X+(-18)×3
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Step-by-step explanation:
a. 18 × [7-3] = 126 + [-54] (+×- = -)
18 × 4 = 126-54
72 = 72
therefore lhs = rhs
b. 21×[-10] = [84]+[126] ( -×- = +)
-210 =/= 210
therefore lhs =/= (is not equal to) rhs
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