How can x + 4 = 3x + 12 be set up as a system of equations?

A. y = x + 1

y = - 3x + 12

B. y = x + 2

y = - 3x + 12

C. y = x + 4

y = 3x + 12

D. y = 4

y = - 3x + 12

What's 21a + 28b factorise fully

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