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(x+3)²=81
x = 6 and x = -12
4x²-10=54
x = 4 and x = -4
7x²+14 = 14
x = 0
(2x+5)²-49=0
x = 1 and x = -6
5x²-10 = -20
x has no real solutions
3x²-7=53
x = -4.472and x = 4.472
6x²+10=58
x = 2.83 and x=-2.83