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3)
x-(7 10/18 - 5 3/18) = -3 1/2
x - 2 7/18 = -3 1/2
x = -3 1/2 +2 7/18
x = -3 9/18 + 2 7/18
x = -1 2/18
x = -1 1/9

4)
x-(-4 3/5 + 3 4/7)= -8 1/14
x -(-4 21/35 + 3 20/35)= -8 1/14
x + 1 1/35 = -8 1/14
x = -8 1/14 - 1 1/35
x = -8 5/70 - 1 2/70
x = -9 7/70
x = -9 1/10