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x-1=7
x=7+1
x=8
b)(2x+1)²=9²
2x+1=9
2x=9-1
2x=8
x=8/2
x=4
c)3(x-3)²=48
(x-3)²=48/3
(x-3)²=16
(x-3)²=4²
x-3=4
x=4+3
x=7