Answer:
6. 4x + 28 + x + 19 + 3x + 13
x = 15
7. x + 123 + 113 + 97 + 90 = 540
x = 117
Explanation:
6. 4x + 28 + x + 19 + 3x + 13 = 180
8x + 60 = 180
8x = 120
x + 423 = 540
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