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All right, so solution in part a, 3x plus 4y, minus y, 7x, minus 7x, minus 7y, minus 7y, is 3x plus 9x, minus 3x, 4y, minus y, minus 7y, which is equal to 16x minus 4y, minus 4y, or b, minus 7x ,000 ,000 ,000 ,000 ,000 ,000 ,000 ,000 ,000 ,000 ,000 ,000 ,000 ,000 ,000, is 6x square, minus 5 x, minus 6, x, x, minus 13 x, minus 7 x, plus 1...