220+x=2/3(510-x)

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distribute the 2/3 into (510-x) to get:220 + x = 340 - 2/3xMove x's to left and numbers to right sides:2/3x + x = 340 - 220Combine like terms:5/3x = 120Multiply both sides by 3/5 to obtain answer:5/3 × 3/5 = 1120 × 3/5 = 72thus:x = 72