21000=[3q-(900000)](0.7)

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Solution for 21000=[3q-(900000)](0.7) equation: 


Simplifying
21000 = [3q + -1(900000)](0.7)

Multiply -1 * 900000
21000 = [3q + -900000](0.7)

Reorder the terms:
21000 = [-900000 + 3q](0.7)

Reorder the terms for easier multiplication:
21000 = 0.7[-900000 + 3q]
21000 = [-900000 * 0.7 + 3q * 0.7]
21000 = [-630000 + 2.1q]

Solving
21000 = -630000 + 2.1q

Solving for variable 'q'.

Move all terms containing q to the left, all other terms to the right.

Add '-2.1q' to each side of the equation.
21000 + -2.1q = -630000 + 2.1q + -2.1q

Combine like terms: 2.1q + -2.1q = 0.0
21000 + -2.1q = -630000 + 0.0
21000 + -2.1q = -630000

Add '-21000' to each side of the equation.
21000 + -21000 + -2.1q = -630000 + -21000

Combine like terms: 21000 + -21000 = 0
0 + -2.1q = -630000 + -21000
-2.1q = -630000 + -21000

Combine like terms: -630000 + -21000 = -651000
-2.1q = -651000

Divide each side by '-2.1'.
q = 310000

Simplifying
q = 310000

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