-28
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c+(-8)= -20
c - 8 = -20 (positive add negative just equals a negative)
c = -20 + 8 (8 is brought to other side and made positive)
Therefore, c = -12
c plus 8 equals 11; now subtract 8 from both sides, then c=3.
a = 20 b = 60 c = 100
2c+(12-4)=20 Simplify the expression in the parentheses first. 2c+8=20 Subtract 8 from both sides of the equation. 2c=12 Divide both sides of the equation by 2. c=6
144 Formula: c= (a2)+(ab)
It is an equation and the value of c works out as 8