Simplifying -1(2.1c + -4d) = 0 (2.1c * -1 + -4d * -1) = 0 (-2.1c + 4d) = 0 Solving -2.1c + 4d = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4d' to each side of the equation. -2.1c + 4d + -4d = 0 + -4d Combine like terms: 4d + -4d = 0 -2.1c + 0 = 0 + -4d -2.1c = 0 + -4d Remove the zero: -2.1c = -4d Divide each side by '-2.1'. c = 1.904761905d
Simplifying c = 1.904761905d <-- this is the answer