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=-(4+M)*2
We move all terms to the left:
-(-(4+M)*2)=0
We add all the numbers together, and all the variables
-(-(M+4)*2)=0
We calculate terms in parentheses: -(-(M+4)*2), so:We get rid of parentheses
-(M+4)*2
We multiply parentheses
-2M-8
Back to the equation:
-(-2M-8)
2M+8=0
We move all terms containing M to the left, all other terms to the right
2M=-8
M=-8/2
M=-4
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