SOLUTION: Having trouble figuring out the calculation to come up with the answer can you help? Frank has 63 baseball cards and hockey cards. 3x the number of baseball cards minus 4x the n

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Question 897189: Having trouble figuring out the calculation to come up with the answer can you help?
Frank has 63 baseball cards and hockey cards. 3x the number of baseball cards minus 4x the number of hockey cards is 126. HOw many of each kind of card does he own?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = number of baseball cards
+63+-+x+ = number of hockey cards
-----------------
+3x+-+4%2A%28+63+-+x+%29+=+126+
+3x+-+252+%2B+4x+=+126+
+7x+=+126+%2B+252+
+7x+=+378+
+x+=+54+
+63+-+x+=+9+
He has 54 baseball cards and 9 hockey cards
check:
+3x+-+4%2A%28+63+-+x+%29+=+126+
+3%2A54+-+4%2A9=+126+
+162+-+36+=+126+
+126+=+126+
OK