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(3-x)(x+1) = 7-x(x+2)
3x-x²+3-x = 7-x²-2x
4x = 4
x = 1
b)
x²+4x = (x-1)(x+3)-1
x²+4x = x²+3x-x-3-1
2x = -4
x = -2
c)
(x-4)(x+1)+4(x+2) = x²-3
x²-4x+x-4+4x+8 = x²-3
x = -7
d)
x(2-x)+(x+2)(x-2) = 2
2x-x²+x²-4 = 2
2x = 6
x = 3