7=8(1+2r)-5(1+3r)

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Solution for 7=8(1+2r)-5(1+3r) equation:


Simplifying
7 = 8(1 + 2r) + -5(1 + 3r)
7 = (1 * 8 + 2r * 8) + -5(1 + 3r)
7 = (8 + 16r) + -5(1 + 3r)
7 = 8 + 16r + (1 * -5 + 3r * -5)
7 = 8 + 16r + (-5 + -15r)

Reorder the terms:
7 = 8 + -5 + 16r + -15r

Combine like terms: 8 + -5 = 3
7 = 3 + 16r + -15r

Combine like terms: 16r + -15r = 1r
7 = 3 + 1r

Solving
7 = 3 + 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 + -1r = 3 + 1r + -1r

Combine like terms: 1r + -1r = 0
7 + -1r = 3 + 0
7 + -1r = 3

Add '-7' to each side of the equation.
7 + -7 + -1r = 3 + -7

Combine like terms: 7 + -7 = 0
0 + -1r = 3 + -7
-1r = 3 + -7

Combine like terms: 3 + -7 = -4
-1r = -4

Divide each side by '-1'.
r = 4

Simplifying
r = 4

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