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Subtract 7 from each side: 12x = 8x + 16Subtract 8x from each side: 4x = 16Divide each side by 4: x = 4
Add 3x to each side: 4 = 5x + 24Subtract 24 from each side: -20 = 5xDivide each side by 5: -4 = x
x + 13 + x + 5 + 200 = 360Add up the x's on the left side of the equation:2x + 13 + 5 + 200 = 360Add up the bare numbers on the left side:2x + 218 = 360Subtract 218 from each side:2x = 142Divide each side by 2 :x = 71
X can't be solved, you don't have anything on the right side of the equal.
Subtract 0.2b from each side: 0.3b + 3.4 = 12.4Subtract 3.4 from each side: 0.3b = 9Multiply each side by 10: 3b = 90Divide each side by 3: b = 30