(-30(-7))-(210(-3))=840

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Solution for (-30(-7))-(210(-3))=840 equation: 


Simplifying
(-30(-7)) + -1(210(-3)) = 840

Multiply -30 * -7
(210) + -1(210(-3)) = 840
210 + -1(210(-3)) = 840

Multiply 210 * -3
210 + -1(-630) = 840

Multiply -1 * -630
210 + 630 = 840

Combine like terms: 210 + 630 = 840
840 = 840

Add '-840' to each side of the equation.
840 + -840 = 840 + -840

Combine like terms: 840 + -840 = 0
0 = 840 + -840

Combine like terms: 840 + -840 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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