Question 1025828
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{{{(Ax-B)/(C-B(1-3x))=7}}}
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{{{(Ax-B)/(C-B-3Bx)=7}}} . Multiply each side by (C-B-3Bx)
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{{{Ax-B=7(C-B-3Bx)}}}
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{{{Ax-B=7C-7B-21Bx}}}
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{{{Ax+21Bx=7C-7B+B}}}
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{{{x(A+21B)=7C-6B}}} Divide each side by (A+21B)
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{{{x=(7C-6B)/(A+21B)}}}