book Maths Puzzle Numerical Ability

Solve and check the equation 3(4 + 4x) = 12x + 12

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book Other Question

hi can you please help me solve this expression...

it says: substitute x=-4 and y=-15 to find the value of this expression
-3(4x-y)

thank you
I'm sorry this is so long but i tried really hard and cannot answer this question!

Pedro can buy Texas oli, priced at 30 dollars per gallon and California oil priced at 15 dolla