find the value of x from this equation ? 7 ( x - 1 ) = 21
1 . divide both sides by 7 : 2 . simplify both sides : x - 1 = 3 3 . add 1 to both sides : x - 1 + 1 = 3 + 1 4 . simplify both sides : x = 4 b
add(divide(21, 7), 1)