40+90=4x-30

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Solution for 40+90=4x-30 equation: 


Simplifying
40 + 90 = 4x + -30

Combine like terms: 40 + 90 = 130
130 = 4x + -30

Reorder the terms:
130 = -30 + 4x

Solving
130 = -30 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
130 + -4x = -30 + 4x + -4x

Combine like terms: 4x + -4x = 0
130 + -4x = -30 + 0
130 + -4x = -30

Add '-130' to each side of the equation.
130 + -130 + -4x = -30 + -130

Combine like terms: 130 + -130 = 0
0 + -4x = -30 + -130
-4x = -30 + -130

Combine like terms: -30 + -130 = -160
-4x = -160

Divide each side by '-4'.
x = 40

Simplifying
x = 40

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