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(3/7)*(-21*x-48) = 0
3/7*(-21*x-48) = 0
( -21*x-48 )
-21*x-48 = 0 // + 48
-21*x = 48 // : -21
x = 48/(-21)
x = -16/7
( 3/7 )
3/7 = 0
x belongs to the empty set
x = -16/7
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