(3r-7)-(4r-15)=6

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Solution for (3r-7)-(4r-15)=6 equation:


Simplifying
(3r + -7) + -1(4r + -15) = 6

Reorder the terms:
(-7 + 3r) + -1(4r + -15) = 6

Remove parenthesis around (-7 + 3r)
-7 + 3r + -1(4r + -15) = 6

Reorder the terms:
-7 + 3r + -1(-15 + 4r) = 6
-7 + 3r + (-15 * -1 + 4r * -1) = 6
-7 + 3r + (15 + -4r) = 6

Reorder the terms:
-7 + 15 + 3r + -4r = 6

Combine like terms: -7 + 15 = 8
8 + 3r + -4r = 6

Combine like terms: 3r + -4r = -1r
8 + -1r = 6

Solving
8 + -1r = 6

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + -1r = 6 + -8

Combine like terms: 8 + -8 = 0
0 + -1r = 6 + -8
-1r = 6 + -8

Combine like terms: 6 + -8 = -2
-1r = -2

Divide each side by '-1'.
r = 2

Simplifying
r = 2

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