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21 x 4 = 84
500 x .4 = 200
x/4 + 5 = -1 (4)x/4 +(4)5 = -1 x+20 = -1 -20 -20 x= -21 x= -21
4 x 21 = 84 = (8 x 10) + (4 x 1)
x-3-7x=21 -6x=21+3 6x=-24 x=-4