2(r-7.50)(0.3)=40

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Solution for 2(r-7.50)(0.3)=40 equation: 


Simplifying
2(r + -7.50)(0.3) = 40

Reorder the terms:
2(-7.50 + r)(0.3) = 40

Reorder the terms for easier multiplication:
2 * 0.3(-7.50 + r) = 40

Multiply 2 * 0.3
0.6(-7.50 + r) = 40
(-7.50 * 0.6 + r * 0.6) = 40
(-4.5 + 0.6r) = 40

Solving
-4.5 + 0.6r = 40

Solving for variable 'r'.

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

Add '4.5' to each side of the equation.
-4.5 + 4.5 + 0.6r = 40 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 0.6r = 40 + 4.5
0.6r = 40 + 4.5

Combine like terms: 40 + 4.5 = 44.5
0.6r = 44.5

Divide each side by '0.6'.
r = 74.16666667

Simplifying
r = 74.16666667

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