[ ( 6 * X - 72 ) ] * 28 = 5628
[ ( 6 * X - 72 ) ] = 5628 : 28
[ ( 6 * X - 72 ) ] = 201
6 * X - 72 = 201
6 * X = 201 + 72
6 * X = 273
X = 273 : 6
X = 45,5
[ ( 6 * X - 72 ) ] * 28 = 5628
( 6 * X - 72 ) = 5628:28
( 6 * X - 72 ) =201
6 * X =201+72
6 * X =273
X =273:6
X =45,5