(3m-4)²=(4m-3)²

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(3m-4)²=(4m-3)²
(3m-4)²=(4m-3)²

(3m-4)²=(4m-3)²
(4m-3)²-(3m-4)²=0
(4m-3+3m-4)(4m-3-3m+4)=0
7(m-1)(m+1)=0
m=1,m=-1

m=+1/-1