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15.5+x÷8=55.5

3x+5(15-x)=55 3x+75-5x=55 3x-5x=55-75 -2x=-20 x=10

(45+55)x=[(45+15)+(55+5)](x-0.25) 100x=[60+60](x-0.25) 100x=120(x-0.25) 100x=120x-30 20x=30 x=1.5

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