To solve the equation \(-1.8 = 0.2 + 0.2c\), we can follow these steps:
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First, simplify the right side: \[ 0.2 + 0.2c = 0.2(1 + c) \]
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Rewrite the equation: \[ -1.8 = 0.2(1 + c) \]
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Divide both sides by 0.2 to isolate \(1 + c\): \[ -\frac{1.8}{0.2} = 1 + c \] \[ -9 = 1 + c \]
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Subtract 1 from both sides: \[ -9 - 1 = c \] \[ c = -10 \]
So the solution is: \[ c = -10 \]