Answer:
3.) x = 15
4.) x = 7
5.) x = 11
6.) x = 14
Explanation:
3.) ( 3x + 30 ) + ( 6x + 15 ) = 180
4.) (6x + 8 ) + ( 3x + 19 ) = 90
5.) (5x - 14 ) + ( 4x + 5 ) = 90
6.) ( 7x - 15 ) + ( 8x - 15 ) = 180
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