To solve the equation \(-3.7a + 1.7 = -6.07\), follow these steps:
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Subtract \(1.7\) from both sides to isolate the term with \(a\):
\[ -3.7a = -6.07 - 1.7 \]
\[ -3.7a = -7.77 \]
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Divide both sides by \(-3.7\) to solve for \(a\):
\[ a = \frac{-7.77}{-3.7} \]
\[ a = 2.1 \]
So, the solution is
\[ \boxed{2.1} \]