Question 405544


{{{2.1x+42=5.2x-20}}} Start with the given equation.



{{{10(2.1x+42)=10(5.2x-20)}}} Multiply both sides by 10 to clear out the decimals.



{{{21x+420=52x-200}}} Distribute and multiply.



{{{21x=52x-200-420}}} Subtract {{{420}}} from both sides.



{{{21x-52x=-200-420}}} Subtract {{{52x}}} from both sides.



{{{-31x=-200-420}}} Combine like terms on the left side.



{{{-31x=-620}}} Combine like terms on the right side.



{{{x=(-620)/(-31)}}} Divide both sides by {{{-31}}} to isolate {{{x}}}.



{{{x=20}}} Reduce.



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Answer:


So the answer is {{{x=20}}} 



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