(.5*42)-(3*.5)-(.8*21)=

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Solution for (.5*42)-(3*.5)-(.8*21)= equation: 


Simplifying
(0.5 * 42) + -1(3 * 0.5) + -1(0.8 * 21) = 0

Multiply 0.5 * 42
(21) + -1(3 * 0.5) + -1(0.8 * 21) = 0
21 + -1(3 * 0.5) + -1(0.8 * 21) = 0

Multiply 3 * 0.5
21 + -1(1.5) + -1(0.8 * 21) = 0

Multiply -1 * 1.5
21 + -1.5 + -1(0.8 * 21) = 0

Multiply 0.8 * 21
21 + -1.5 + -1(16.8) = 0

Multiply -1 * 16.8
21 + -1.5 + -16.8 = 0

Combine like terms: 21 + -1.5 = 19.5
19.5 + -16.8 = 0

Combine like terms: 19.5 + -16.8 = 2.7
2.7 = 0

Solving
2.7 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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