find x = 5x + 5x+1 + 5x+2 = 775
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5x + 5x + 1 + 5x + 2= 775
15x + 3= 775
15x=775 - 3
15x = 772
x = 772÷ 15
x = 51.6
15x + 3= 775
15x=775 - 3
15x = 772
x = 772÷ 15
x = 51.6
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