4(1-3x)-(7x+2)(5+x) = 4 * 1 - 4 * 3x - ( 7x * 5 + 7x * x + 2 * 5 + 2 * x )
= 4 - 12x - (35x + 7x² + 10 + 2x)
= 4 - 12x - 35x - 7x² - 10 - 2x
= -7x² - 49x - 6
