-3(-5.142)-7y=21

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Solution for -3(-5.142)-7y=21 equation: 


Simplifying
-3(-5.142) + -7y = 21

Multiply -3 * -5.142
15.426 + -7y = 21

Solving
15.426 + -7y = 21

Solving for variable 'y'.

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

Add '-15.426' to each side of the equation.
15.426 + -15.426 + -7y = 21 + -15.426

Combine like terms: 15.426 + -15.426 = 0.000
0.000 + -7y = 21 + -15.426
-7y = 21 + -15.426

Combine like terms: 21 + -15.426 = 5.574
-7y = 5.574

Divide each side by '-7'.
y = -0.7962857143

Simplifying
y = -0.7962857143

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