$0.3 x + 0.5 = 0.4 x - 0.2$ , then $x$ is equal to

x = 3

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x = 5

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x = 7

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None of these

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Solution

The correct option is C $x = 7$
Given: $0.3 x + 0.5 = 0.4 x - 0.2$
$⟹ 0.3 x - 0.4 x = - 0.2 - 0.5 [T r a n s p o s i n g 0.4 x t o L H S a n d 0.5 t o R H S] ⟹ - 0.1 x = - 0.7 ⟹ 0.1 x = 0.7 ⟹ \frac{x}{10} = \frac{7}{10} ⟹ x = 7$

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