Question

$3(5-x)-3(1-2x)=42$

Answer 1

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$\sf3(5-x)-3(1-2x)=42 \\ \\ \sf15 - 3x - 3 + 6x = 42 \\ \\ \sf - 3x + 6x = 42 - 12 \\ \\ \sf 3x = 30 \\ \\ \sf \: x = \frac{ \cancel{30}}{ \cancel3} \\ \\ \sf \: x = 10$

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