7.8=(10+r)(1)

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Solution for 7.8=(10+r)(1) equation: 


Simplifying
7.8 = (10 + r)(1)

Reorder the terms for easier multiplication:
7.8 = 1(10 + r)
7.8 = (10 * 1 + r * 1)
7.8 = (10 + 1r)

Solving
7.8 = 10 + 1r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
7.8 + -1r = 10 + 1r + -1r

Combine like terms: 1r + -1r = 0
7.8 + -1r = 10 + 0
7.8 + -1r = 10

Add '-7.8' to each side of the equation.
7.8 + -7.8 + -1r = 10 + -7.8

Combine like terms: 7.8 + -7.8 = 0.0
0.0 + -1r = 10 + -7.8
-1r = 10 + -7.8

Combine like terms: 10 + -7.8 = 2.2
-1r = 2.2

Divide each side by '-1'.
r = -2.2

Simplifying
r = -2.2

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