Solve the equation and check your answer. If the answer is a fraction write it decimal form to the hundredths place.
2x+4(3-2x)=3(2x+2)/6+4

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is