Question 195171
{{{0.12(x-10)-0.05(x-30)=-1.80}}} Start with the given equation.



{{{12(x-10)-5(x-30)=-180}}} Multiply EVERY term (that's outside the parenthesis), by 100 to make every number a whole number.



{{{12x-120-5x+150=-180}}} Distribute.



{{{7x+30=-180}}} Combine like terms on the left side.



{{{7x=-180-30}}} Subtract {{{30}}} from both sides.



{{{7x=-210}}} Combine like terms on the right side.



{{{x=(-210)/(7)}}} Divide both sides by {{{7}}} to isolate {{{x}}}.



{{{x=-30}}} Reduce.



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Answer:


So the answer is {{{x=-30}}}